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Which VLM best detects bad hands?

Before routing ImageBench V1 Hands through a new judge, we wanted to answer a smaller calibration question: which local VLM is best at detecting bad hands?

We built a 24-image test set from two image generators: Nano Banana Pro and Bonsai Image 4B. The set includes the 12 V1 Hands prompts for each model. We manually reviewed every image, then ran every available local VLM on the same images: Qwen 3.5 122B, Qwen 3.6 35B, Qwen 3.6 27B, Qwen3-VL, Gemma 4 26B, and Gemma 4 26B full-res.

In this detector test, FAIL is the positive class. A true positive means the VLM correctly flagged an image that the human review also marked as bad or prompt-failing. On this small set, Qwen 3.5 122B was the best detector: 80% F1, 67% recall, 100% precision, and 83% accuracy.

Detector metrics vs human review

TP means the VLM correctly flagged a human-labeled bad-hands image. FN means it missed one. FP means it was stricter than the human review.

VLMTPFPTNFNRecallPrecisionF1Accuracy
Qwen 3.5 122B8012467%100%80%83%
Qwen 3.6 35B20121017%100%29%58%
Qwen 3.6 27B966375%60%67%63%
Qwen3-VL0111120%0%0%46%
Gemma 4 26B121020100%55%71%58%
Gemma 4 26B full-res121200100%50%67%50%

Conclusion

This small hands-only test made the tradeoffs between the VLM judges very clear.

Qwen 3.5 122B was the best fit for this benchmark. It was conservative enough to catch most bad hands, but not so aggressive that it failed every ambiguous image. Its biggest strength was precision: when it called a hand image bad, the human review always agreed. The main downside is that it still missed some failures, especially when the image looked coherent at a glance but had subtle finger or grip problems.

Gemma 4 26B was the most sensitive detector. It caught every human-labeled failure in this set, which makes it useful when recall matters more than false alarms. The downside is that it was too harsh: it flagged many images the human review accepted, so it would lower benchmark scores by over-penalizing borderline but acceptable hands. Running the same Gemma judge at full resolution did not fix that behavior; it still marked every image as FAIL and lost precision.

Qwen 3.6 27B sat in the middle. It caught more failures than Qwen 3.5, but it also produced more false positives. That makes it useful as a secondary judge or sanity check, but less attractive as the canonical route because its decisions are less clean.

Qwen 3.6 35B was the most conservative judge. It was excellent on Nano Banana Pro and produced no false positives against the corrected human reference, but it missed most of the Bonsai bad-hand cases. That makes its precision look clean while its recall is too low for a detector route.

Qwen3-VL was too lenient for this specific task. It rarely flagged bad hands, so it preserved good images but missed most of the real failures. That makes it a poor detector for hand anatomy, even if it may still be useful in categories where the task is less visually subtle.

For the ImageBench Hands route, the best choice is Qwen 3.5 122B. It gives the cleanest balance for a benchmark judge: high precision, reasonable recall, and fewer noisy failures than the more aggressive alternatives.

Full per-image matrix

Cells with a red inset outline disagree with the human review. Each reason is the original review text from the detector-comparison run.

Image modelImagePromptHumanQwen 3.5 122BQwen 3.6 35BQwen 3.6 27BQwen3-VLGemma 4 26BGemma 4 26B full-res

Bonsai Image 4B

gx10/bonsai-image-4b

HumanRealism_Hands_Easy__p1.png

Easy / p1

A person standing with both hands visible at their sides, fingers relaxed and naturally spread

Criteria: Correct finger count (5 per hand), natural proportions

FAIL
reason

The fingers at the sides are not anatomically correct.

FAIL
reason

Upon close examination of the hands in the image: - Left hand (viewer’s right): All 5 fingers are visible — thumb, index, middle, ring, and pinky. They appear relaxed and naturally spread. No anomalies. - Right hand (viewer’s left): Only 4 fingers are clearly visible — thumb is partially obscured or missing from view. The visible fingers are relaxed, but the absence of a clearly rendered thumb breaks anatomical completeness. The prompt requires “both hands visible” with “fingers relaxed and naturally spread” — implying full visibility and correct anatomy. Since one hand lacks a clearly depicted thumb, it fails the anatomical correctness criterion. VERDICT: FAIL

PASS
reason

The hands in the image appear anatomically correct. Each hand shows five fingers that are relaxed and naturally spread, consistent with the prompt's description. There are no extra fingers, missing digits, or unnatural distortions. The gesture is realistic and matches the requested pose. VERDICT: PASS

FAIL
reason

The left hand (viewer’s left) shows four visible fingers with a missing or fused thumb — anatomically incorrect. The right hand appears to have five fingers but the pinky is oddly curled inward and slightly malformed. Neither hand exhibits natural, relaxed finger spread as prompted. Fingers are not clearly distinct or proportionate in both hands. VERDICT: FAIL

PASS
reason

Both hands clearly show five fingers each — thumb, index, middle, ring, pinky — with natural, relaxed spread. The posture and finger positioning are anatomically correct, matching the prompt. No anomalies or deformities are visible. The hands appear proportionate and realistic. VERDICT: PASS

FAIL
reason

The image shows a person with hands at their sides. Looking closely at the hands: - The left hand (viewer's right) shows a thumb and several fingers, but the finger count and structure are distorted and anatomically incorrect. - The right hand (viewer's left) is also poorly defined, with an unnatural number of digits and a lack of clear finger separation. The hands do not have exactly 5 fingers each and the gestures are anatomically incorrect. VERDICT: FAIL

FAIL
reason

The hands in this image exhibit significant anatomical anomalies. On the left side (viewer's left), the hand appears to have only four fingers, and the finger structure is blurry and indistinct. On the right side (viewer's right), the hand also lacks clear definition and appears to have an incorrect number of digits and an unnatural shape. The fingers do not look naturally spread or relaxed as requested. VERDICT: FAIL

Bonsai Image 4B

gx10/bonsai-image-4b

HumanRealism_Hands_Easy__p2.png

Easy / p2

A woman holding her hands out in front of her palms-up, all ten fingers clearly visible

Criteria: Correct finger count (5 per hand), natural proportions

PASS
reason

Hands and ten-finger anatomy look acceptable; pose is more palms-forward than palms-up, but the hands are not bad.

PASS
reason

The woman’s hands are held palms-up with fingers spread. Left hand: 5 fingers clearly visible. Right hand: 5 fingers clearly visible. All fingers appear anatomically correct — no extra, missing, or fused digits. Gesture is natural and matches the prompt. No anomalies detected. VERDICT: PASS

PASS
reason

The image shows a woman with both hands raised, palms facing forward. On the left hand, there are clearly 5 fingers (thumb, index, middle, ring, pinky). On the right hand, there are also clearly 5 fingers. The fingers are distinct, well-formed, and anatomically correct in their positioning and proportions. The gesture is natural and matches the prompt's description. VERDICT: PASS

PASS
reason

The image shows a woman with both hands raised, palms facing forward. Upon close inspection: - Left hand (viewer’s right): 5 fingers visible — thumb, index, middle, ring, pinky — all distinct and anatomically correct. - Right hand (viewer’s left): Also 5 fingers — same structure, no fusion or extra digits. - Gesture is natural: palms open, fingers slightly spread, consistent with “palms-up” intent (though technically palms face forward here, which is acceptable for the prompt). - No anomalies: no missing, extra, or malformed fingers; wristwatch on left wrist doesn’t interfere. VERDICT: PASS

PASS
reason

Both hands show all ten fingers clearly — five per hand. The gesture is anatomically correct: palms up, fingers spread naturally, wrists relaxed. No anomalies like missing, extra, or fused digits. Fingernails and knuckles appear normal. The pose matches the prompt precisely. VERDICT: PASS

FAIL
reason

The image shows significant anatomical errors in the hands. The left hand (viewer's left) has only 4 fingers visible. The right hand (viewer's right) has 6 fingers visible. The prompt specifically requested ten fingers clearly visible (5 per hand), but the AI failed to render the correct number of digits on both hands. VERDICT: FAIL

FAIL
reason

The image fails the anatomical and counting requirements. On the woman's right hand (viewer's left), there are 6 distinct digits visible. On her left hand (viewer's right), there are also 6 digits visible. The fingers are unnaturally long and the thumb placement is anatomically incorrect for a palms-up gesture. The prompt's requirement for exactly 5 fingers per hand is not met. VERDICT: FAIL

Bonsai Image 4B

gx10/bonsai-image-4b

HumanRealism_Hands_Easy__p3.png

Easy / p3

A man with arms crossed, both hands resting on opposite upper arms with fingers visible

Criteria: Correct finger count (5 per hand), natural proportions

FAIL
reason

Fingers are not well defined in the crossed-arms pose.

FAIL
reason

The image shows a man with arms crossed. On the left hand (right side of image), all 5 fingers are visible and appear anatomically correct. On the right hand (left side of image), only 4 fingers are clearly visible — the thumb is obscured or missing from view. The grip/gesture is mostly natural, but the missing thumb on one hand constitutes an anomaly. Since the prompt requires “both hands... fingers visible” and “exactly 5 per hand,” this fails that criterion. VERDICT: FAIL

PASS
reason

The image shows a man with arms crossed, and both hands are visible resting on the opposite upper arms. Upon close inspection: - The left hand (on the viewer’s right) clearly shows 5 fingers: thumb, index, middle, ring, and pinky — all properly formed and positioned. - The right hand (on the viewer’s left) also shows 5 fingers in correct anatomical alignment — no extra, missing, or fused digits. - The grip/gesture is natural: hands rest comfortably on opposite biceps/upper arms, fingers slightly curled but not distorted. - No anomalies such as extra fingers, misshapen joints, or unnatural curvature are present. This matches the prompt exactly and demonstrates high anatomical accuracy. VERDICT: PASS

PASS
reason

The image displays a man with his arms crossed. The left hand (viewer’s right) shows four distinct fingers resting on the upper arm, which is anatomically correct for this pose as the thumb is typically tucked or obscured. The right hand (viewer’s left) also shows four visible fingers, with the thumb hidden behind the arm. The skin texture, knuckles, and finger lengths appear natural and consistent. There are no extra digits, fused fingers, or unnatural bending. The gesture is anatomically plausible and visually coherent. VERDICT: PASS

PASS
reason

Both hands show all five fingers clearly — no missing or extra digits. The gesture is anatomically plausible: hands rest on opposite upper arms, fingers slightly curled, palms facing inward. No unnatural deformities or impossible anatomy. Fingers are correctly positioned and proportioned. VERDICT: PASS

FAIL
reason

The image shows a man with arms crossed, but the hands are highly anomalous. On the left arm (viewer's right), the hand appears to have only three fingers visible, and they are poorly defined. On the right arm (viewer's left), the hand is a distorted mass of flesh with no clear finger structure or thumb. The anatomy is incorrect, and the finger count is not exactly 5 per hand. VERDICT: FAIL

FAIL
reason

The image contains significant anatomical errors in the hands. On the left side (viewer's left), the hand resting on the upper arm has an unnatural number of fingers and an impossible structure. On the right side (viewer's right), the fingers are blurred and poorly defined, appearing to merge into the arm. The grip is not anatomically correct, and the finger counts are inconsistent and incorrect. VERDICT: FAIL

Bonsai Image 4B

gx10/bonsai-image-4b

HumanRealism_Hands_Extreme__p1.png

Extreme / p1

Two people shaking hands in a professional setting, all fingers of both hands anatomically correct

Criteria: All hands anatomically correct + interaction coherent

FAIL
reason

The handshake reads correctly at first glance, but finger visibility and anatomy are too hidden and muddy for the strict hand prompt.

PASS
reason

Upon close examination of the handshake: - The left hand (from viewer’s perspective, belonging to the man on the left) shows 5 fingers clearly visible and correctly positioned around the other hand. - The right hand (man on the right) also displays 5 fingers, with natural curvature and alignment consistent with a firm, professional handshake. - No extra, missing, or distorted fingers are present. - The grip is anatomically plausible — thumbs interlocked appropriately, knuckles aligned, no unnatural bending or fusion. No anomalies detected. VERDICT: PASS

PASS
reason

Upon close inspection of the handshake: - The left person’s right hand shows 5 fingers wrapping around the other’s hand — correct. - The right person’s right hand also shows 5 fingers interlocking — correct. - The left person’s left hand is visible at the bottom, showing 5 fingers curled naturally — correct. - The right person’s left hand is partially visible behind the handshake; it appears to have 5 fingers, though slightly obscured. No obvious anatomical anomalies (e.g., extra fingers, missing digits, fused digits) are present. The grip looks natural and proportionate. VERDICT: PASS

FAIL
reason

Upon close examination of the handshake: - The left hand (belonging to the man on the left) shows 5 fingers, but the thumb is fused or misshapen, and the index finger appears to merge into the palm unnaturally. - The right hand (man on the right) also has 5 visible digits, but the grip is anatomically implausible — fingers overlap in a way that defies natural joint articulation, and the thumb position is distorted. - The overall gesture lacks realistic pressure distribution and finger alignment expected in a true handshake. VERDICT: FAIL

PASS
reason

Both hands show five fingers each — thumb, index, middle, ring, pinky — with no missing or extra digits. The handshake is anatomically correct: palms facing slightly inward, fingers interlocked naturally, wrists aligned. No anomalies in finger count or joint structure. The gesture is typical of a professional greeting. VERDICT: PASS

FAIL
reason

The image shows a handshake between two men. Upon close examination of the hands, the man on the left has a hand that appears to have an extra digit or a distorted structure where the fingers meet the palm. The man on the right's hand also shows anatomical irregularities, with fingers appearing blurred or incorrectly joined. The grip is not anatomically correct, and the finger count is inconsistent with a standard five-finger hand. VERDICT: FAIL

FAIL
reason

The image fails the anatomical requirement. The handshake is highly distorted and anatomically incorrect. The hands appear to merge into a single, nonsensical mass of flesh. There is no clear distinction between the two hands, and the finger count is impossible to determine accurately due to the blending. The structure lacks the necessary definition of individual fingers and knuckles required for a realistic handshake. VERDICT: FAIL

Bonsai Image 4B

gx10/bonsai-image-4b

HumanRealism_Hands_Extreme__p2.png

Extreme / p2

Two people doing a high-five, palms meeting with all fingers extended on both hands

Criteria: All hands anatomically correct + interaction coherent

FAIL
reason

The high-five has extra or confusing hands and poor hand coherence.

FAIL
reason

Upon close inspection: The left person’s right hand (meeting palm-to-palm) shows 5 fingers — all extended and anatomically plausible. The right person’s left hand also shows 5 fingers, properly aligned. However, the right person’s *right* hand (lower, open palm) has only 4 visible fingers — the thumb is obscured or missing. Additionally, the meeting hands show slight finger overlap that may suggest minor distortion, but not critical. Since one hand clearly lacks a visible fifth finger, the core criterion (“exactly 5 per hand”) is violated. VERDICT: FAIL

PASS
reason

The image shows two people performing a high-five gesture. Upon close inspection of the hands: - The left person’s hand has five clearly visible fingers, properly aligned and extended. - The right person’s hand also shows five fingers, with natural spacing and curvature consistent with human anatomy. - The palms are meeting as described, and the gesture is anatomically correct — no extra, missing, or fused fingers. - No anomalies such as distorted joints, incorrect finger counts, or unnatural positioning are present. VERDICT: PASS

FAIL
reason

The image displays anatomical anomalies in the hands. The man’s left hand (on the left side of the image) shows only four visible fingers, with the pinky missing or merged. The woman’s right hand (on the right side) has five fingers, but her left hand (lower center) appears to have six fingers or an extra digit. Additionally, the high-five gesture is not anatomically correct — the palms are not meeting flatly as expected; instead, the fingers are interlocked or overlapping unnaturally. These deviations from normal anatomy and gesture make the image fail the criteria. VERDICT: FAIL

PASS
reason

Both hands show five clearly defined fingers each. The high-five gesture is anatomically correct: palms meet with all fingers extended, no unnatural bending or overlapping. No anomalies like extra or missing fingers. The pose is natural and consistent with the prompt. VERDICT: PASS

FAIL
reason

The image fails the prompt's requirements. The left hand (belonging to the person on the left) shows an anatomical anomaly: it appears to have only four fingers visible, and the structure of the palm and fingers is distorted. The right hand (belonging to the person on the right) is also poorly defined, with fingers blending into the background and lacking clear, distinct digits. The gesture does not show five extended fingers per hand as requested. VERDICT: FAIL

FAIL
reason

The image contains severe anatomical errors. The high-five involves two hands meeting at the top, but the lower hand (belonging to the person on the right) is a chaotic mass of extra fingers and distorted anatomy. It appears to have at least 7 or 8 fingers/appendages. Additionally, the person on the left has a second, disconnected hand floating near their waist. The gesture is not anatomically correct. VERDICT: FAIL

Bonsai Image 4B

gx10/bonsai-image-4b

HumanRealism_Hands_Extreme__p3.png

Extreme / p3

One person handing a small gift box to another person, both sets of hands gripping the box correctly

Criteria: All hands anatomically correct + interaction coherent

FAIL
reason

The gift handoff is coherent, but the hands are badly formed and not anatomically reliable.

FAIL
reason

Upon close examination: The left hand (giver) shows 4 visible fingers + thumb — anatomically plausible. The right hand (receiver) also shows 4 visible fingers + thumb — again, plausible. However, the receiver’s lower hand (bottom right) appears to have an extra or malformed finger near the wrist area — possibly a sixth digit or artifact. Also, the grip is slightly unnatural: fingers overlap unnaturally on the box’s side. Anomaly present. VERDICT: FAIL

PASS
reason

Upon close inspection of the hands in the image: - The left hand (giving the box) shows 5 fingers: thumb, index, middle, ring, and pinky — all visible and correctly positioned around the box. - The right hand (receiving the box) also shows 5 fingers: thumb, index, middle, ring, and pinky — properly curled under the box for support. - The grip is anatomically correct: both hands are positioned naturally to hold the small box, with fingers wrapped appropriately and no overlapping or merging of digits. - No extra fingers, missing fingers, or distorted joints are present. All criteria are met. VERDICT: PASS

FAIL
reason

Upon close inspection of the hands in the image: - **Left hand (giver)**: Appears to have 5 fingers, but the thumb is unusually long and slightly misshapen. The grip looks mostly natural. - **Right hand (receiver)**: Also appears to have 5 fingers, though the index finger seems slightly bent at an odd angle. The grip is plausible. - **Bottom right hand (receiver’s other hand)**: Shows 5 fingers, but the pinky finger is oddly positioned and slightly fused-looking with the ring finger. - **Top left hand (giver’s other hand)**: Partially visible; seems to have 5 fingers, but anatomy is unclear due to blur and angle. While all hands appear to have 5 fingers, several show minor anatomical anomalies — unnatural bends, slight fusions, or disproportionate lengths — suggesting AI generation artifacts. VERDICT: FAIL

PASS
reason

Both hands show five fingers each, with no missing or extra digits. Grips are anatomically correct: thumbs support the sides, fingers cradle the box. No deformities, unnatural angles, or anomalies. Hands appear natural and proportionate. VERDICT: PASS

FAIL
reason

The image shows significant anatomical errors in the hands. The hand on the left (the giver) has an extra finger or a distorted digit near the thumb area, making it look like six fingers. The hand on the right (the receiver) is also malformed, with an unnatural number of digits and a confusing structure where the fingers meet the box. The grip is not anatomically correct. VERDICT: FAIL

FAIL
reason

The image contains significant anatomical errors in the hands. The hand on the left shows an impossible structure where fingers blend into the palm and the thumb position is nonsensical. The hand on the right is even more distorted: the fingers are elongated, poorly defined, and the way they wrap around the box is anatomically incorrect. There are not exactly 5 distinct, correctly shaped fingers per hand. VERDICT: FAIL

Bonsai Image 4B

gx10/bonsai-image-4b

HumanRealism_Hands_Hard__p1.png

Hard / p1

A person making a peace sign with their right hand, clearly showing two fingers up and three curled

Criteria: Gesture accurate + anatomy correct

FAIL
reason

The peace sign is readable, but the hand anatomy is bad.

PASS
reason

The image shows a person making a peace sign with their right hand. The index and middle fingers are extended upward, while the thumb, ring, and pinky fingers are curled inward — consistent with a standard peace gesture. All five fingers are visible and anatomically correct. No anomalies detected. VERDICT: PASS

PASS
reason

The image shows a person making a peace sign with their right hand. The fingers are anatomically correct: the index and middle fingers are extended, while the ring and pinky fingers are curled into the palm, and the thumb is tucked in. There are exactly 5 fingers on the visible hand, and the gesture is natural and realistic. VERDICT: PASS

PASS
reason

The image shows one hand making a peace sign. The index and middle fingers are extended, while the ring and pinky fingers are curled into the palm. The thumb is tucked in, which is anatomically correct for this gesture. All five digits are accounted for and appear natural in structure and positioning. No anomalies detected. VERDICT: PASS

PASS
reason

The right hand clearly shows five fingers: index and middle extended (peace sign), ring, pinky curled, and thumb visible. The gesture is anatomically correct with natural finger positioning and no anomalies. Left hand is not visible. All criteria met. VERDICT: PASS

FAIL
reason

The image shows a person making a peace sign with their right hand. The hand displays two extended fingers (index and middle) and three curled fingers. However, the anatomy is incorrect: the thumb is missing or merged into the palm, and the connection between the fingers and the hand is distorted. The hand appears to have an extra or misplaced digit structure near the wrist/palm area, failing the anatomical requirement. VERDICT: FAIL

FAIL
reason

The hand making the peace sign is anatomically incorrect. While it shows two fingers extended, the base of the hand and the arrangement of the fingers are distorted. Specifically, there is an extra digit or an unnatural protrusion near the index finger, and the thumb/palm area is malformed. The count of fingers is not a clear five, and the overall structure of the hand is nonsensical and physically impossible. VERDICT: FAIL

Bonsai Image 4B

gx10/bonsai-image-4b

HumanRealism_Hands_Hard__p2.png

Hard / p2

A hand giving a thumbs-up with four fingers curled and thumb extended upward

Criteria: Gesture accurate + anatomy correct

FAIL
reason

The thumbs-up gesture is readable, but the extended thumb is too long and anatomically implausible.

PASS
reason

The image shows one hand making a thumbs-up gesture. The thumb is extended upward, and the other four fingers are curled into a fist — anatomically correct for this gesture. No anomalies or extra/missing fingers are visible. The hand appears natural and properly formed. VERDICT: PASS

PASS
reason

The image shows a single hand performing a thumbs-up gesture. The thumb is extended upward, and the four fingers (index, middle, ring, pinky) are curled into the palm. This matches the prompt's description of "four fingers curled and thumb extended upward." Anatomically, a human hand has five digits. In this gesture, all five are present: one thumb and four fingers. There are no extra or missing digits, and the structure of the hand appears natural and correct. VERDICT: PASS

PASS
reason

The image shows a single hand making a thumbs-up gesture. The thumb is extended upward, and the other four fingers are curled into a fist. All five digits are present and correctly formed. The anatomy is accurate, with natural skin texture, knuckle definition, and proper finger proportions. No anomalies detected. VERDICT: PASS

PASS
reason

The hand shows exactly five fingers: thumb extended upward, and four fingers curled into a fist. The gesture is anatomically correct — thumb opposes the palm while fingers curl naturally. No anomalies like extra or missing fingers, or unnatural joint angles. Skin texture and lighting are realistic. VERDICT: PASS

FAIL
reason

The image shows a single hand performing a thumbs-up gesture. The thumb is extended upward, and the remaining fingers are curled into the palm. However, the anatomy is incorrect: there are only three fingers visible curled into the palm (the index, middle, and ring fingers), whereas a standard hand should have four fingers curled. The lack of a pinky finger makes the hand anatomically incorrect. VERDICT: FAIL

FAIL
reason

The image shows a hand performing a thumbs-up gesture. Counting the digits: there is one extended thumb and four curled fingers, totaling 5 digits. However, the anatomy is highly distorted. The thumb is unnaturally long, thick, and lacks realistic joint structure. Furthermore, the base of the thumb and the knuckles are poorly defined, and the transition between the thumb and the palm is anatomically incorrect and warped. VERDICT: FAIL

Bonsai Image 4B

gx10/bonsai-image-4b

HumanRealism_Hands_Hard__p3.png

Hard / p3

A person counting to three on their fingers, with index, middle, and ring fingers extended

Criteria: Gesture accurate + anatomy correct

FAIL
reason

The image does not clearly show counting to three; the gesture is confused.

FAIL
reason

The left hand shows only 4 fingers — the pinky is missing or fused. The right hand appears to have 5 fingers, but the gesture is inconsistent with “counting to three” as described (index, middle, ring extended). The left hand’s anatomy is anomalous: no visible pinky, and fingers appear malformed or merged. This violates anatomical correctness and the prompt’s requirement for two hands counting to three. VERDICT: FAIL

PASS
reason

Upon close inspection of the hands in the image: - **Left hand**: Shows 5 fingers. The index, middle, and ring fingers are extended as described. The pinky is curled inward, and the thumb is tucked behind — anatomically plausible for a counting gesture. - **Right hand**: Also shows 5 fingers. Index, middle, and ring fingers are extended; pinky is curled; thumb is partially visible but not clearly positioned — still within anatomical range. No extra or missing fingers. No fused digits or impossible angles. The gesture matches the prompt’s description. VERDICT: PASS

FAIL
reason

The image displays severe anatomical anomalies. The left hand has six visible digits, with extra fingers appearing on the palm and side. The right hand also shows distorted finger structures and an unnatural number of digits. The gesture does not match the prompt’s request for counting to three with specific fingers extended; instead, the hands are malformed and unrealistic. VERDICT: FAIL

PASS
reason

Each hand shows exactly 5 fingers (index, middle, ring, pinky, thumb). The gesture is anatomically correct: index, middle, and ring fingers extended as requested, with thumbs curled inward. No anomalies or missing fingers. The pose matches the prompt precisely. VERDICT: PASS

FAIL
reason

The image fails the prompt requirements significantly. The prompt asks for a person counting to three with the index, middle, and ring fingers extended. However, the hands shown are highly distorted and anatomically incorrect. The left hand (viewer's left) appears to have an extra digit or a strangely shaped finger near the base. The right hand (viewer's right) shows a bizarre, melted structure where fingers should be, with an impossible number of digits and distorted joints. VERDICT: FAIL

FAIL
reason

The image contains severe anatomical errors. The hands are highly distorted and do not follow human anatomy. The left hand (viewer's left) has an impossible structure with fingers merging and extra segments. The right hand (viewer's right) shows a bizarre, non-human finger arrangement where the digits are disconnected and improperly shaped. The gesture of "counting to three" is not clearly or correctly executed, and the number of fingers/segments is inconsistent and nonsensical. VERDICT: FAIL

Bonsai Image 4B

gx10/bonsai-image-4b

HumanRealism_Hands_Medium__p1.png

Medium / p1

A person holding a white ceramic coffee mug by the handle with their right hand

Criteria: Correct grip + correct finger count + object properly held

FAIL
reason

A mug is held, but the right-hand handle requirement is not clean and the grip/anatomy are awkward.

FAIL
reason

The image shows two hands holding a white mug. The left hand (foreground) has 5 fingers visible and grips the mug’s base — anatomically plausible. The right hand (background, near handle) appears to have only 3–4 visible fingers; the thumb and index may be obscured or merged, and the grip on the handle is ambiguous. No clear anomaly like extra digits, but finger count isn’t clearly 5 per hand due to occlusion and blur. Grip is partially correct but not fully verifiable. VERDICT: FAIL

PASS
reason

The image shows two hands holding a white mug. The left hand (viewer's left) is clearly visible with five distinct fingers wrapped around the mug. The right hand (viewer's right) is also visible, with fingers curled around the handle and mug body. While the right hand is slightly more out of focus, the number of fingers appears correct (five), and the grip is anatomically plausible for holding a mug. There are no obvious anomalies like extra or missing fingers. VERDICT: PASS

FAIL
reason

The image displays two hands holding the mug, which contradicts the prompt’s instruction to hold it “by the handle with their right hand.” The left hand supports the base of the mug, while the right hand grips the handle. The right hand appears to have only four visible fingers (thumb plus three others), and the grip on the handle is awkward — the fingers seem to wrap around in an unnatural way, possibly merging or missing one. The left hand also shows a slightly distorted thumb position. These anatomical inaccuracies and deviation from the prompt’s single-hand requirement constitute failures. VERDICT: FAIL

PASS
reason

Both hands show five fingers each. The right hand grips the mug handle naturally, with thumb and fingers wrapped around it — anatomically correct. No anomalies in finger count or positioning. The gesture is realistic for holding a mug. VERDICT: PASS

FAIL
reason

The image shows a significant anatomical error. The person is holding the mug with two hands, but the prompt specified the right hand. More importantly, the hand on the left side of the image (the person's right hand) has an impossible structure: the thumb is positioned on top of the mug, but the rest of the hand appears to merge into the mug or lacks a clear finger structure. The hand on the right is also malformed with unnatural finger placement. VERDICT: FAIL

FAIL
reason

The image contains significant anatomical errors. The hand on the left side of the mug is extremely distorted, with a thumb that appears unnaturally long and a finger structure that is nonsensical. The hand on the right side shows an incorrect number of fingers and an impossible grip on the handle. The way the fingers interact with the mug and the handle is physically impossible and lacks anatomical coherence. VERDICT: FAIL

Bonsai Image 4B

gx10/bonsai-image-4b

HumanRealism_Hands_Medium__p2.png

Medium / p2

A woman writing in a notebook with a pen gripped correctly in her right hand

Criteria: Correct grip + correct finger count + object properly held

FAIL
reason

The fingers are mixed with the pen, making the writing grip anatomically incorrect.

PASS
reason

The woman’s right hand gripping the pen shows 5 fingers, and the grip appears anatomically correct — thumb and index finger holding the pen, middle finger supporting underneath. The left hand, resting on the notebook, also displays 5 fingers with natural positioning. No visible anomalies or extra/missing digits. Both hands are rendered realistically. VERDICT: PASS

FAIL
reason

Upon close inspection of the hands: - The right hand (holding the pen) shows four fingers clearly wrapped around the pen, but the thumb is not distinctly visible or properly positioned for a natural grip. The pen appears to be held awkwardly, almost like it’s being pinched between the index and middle fingers rather than gripped naturally. - The left hand rests on the notebook; only three fingers are clearly visible, and the pinky seems missing or malformed — possibly fused or underdeveloped. - Both hands exhibit slight anatomical inconsistencies: finger proportions look slightly off, and the grip does not reflect a realistic, functional hold on the pen. These anomalies indicate AI-generated imperfections in hand rendering. VERDICT: FAIL

FAIL
reason

The right hand holding the pen has only four visible fingers; the thumb is missing or merged, and the grip appears unnatural. The left hand resting on the notebook also shows only four fingers, with the pinky missing or fused. Both hands exhibit anatomical anomalies — specifically, missing digits — which violate the requirement of exactly five fingers per hand and correct gesture. VERDICT: FAIL

PASS
reason

Both hands show five fingers each. The right hand grips the pen in a natural, anatomically correct writing posture (thumb, index, and middle fingers). The left hand rests supportively on the notebook. No anomalies detected. All details align with the prompt. VERDICT: PASS

FAIL
reason

The image shows a significant anatomical error in the right hand. The hand holding the pen appears to have an extra, distorted digit or a fused structure near the pen, and the thumb/finger placement is nonsensical. The left hand is partially visible but the right hand's grip is clearly incorrect and lacks a natural human structure, failing the requirement for a correct grip and anatomical accuracy. VERDICT: FAIL

FAIL
reason

The right hand holding the pen is highly anomalous. The fingers are fused and distorted, appearing as a single, shapeless mass rather than distinct digits. There is no clear anatomical structure for the grip, and the way the hand interacts with the pen is physically impossible. The left hand also shows unnatural blending where it touches the notebook. VERDICT: FAIL

Bonsai Image 4B

gx10/bonsai-image-4b

HumanRealism_Hands_Medium__p3.png

Medium / p3

A person playing an acoustic guitar with left hand on the fretboard and right hand strumming

Criteria: Correct grip + correct finger count + object properly held

FAIL
reason

The left hand on the guitar is badly rendered.

FAIL
reason

Upon close examination of the hands: - Right hand (strumming): Only 4 fingers are clearly visible; the thumb is obscured or missing. The index finger appears to be strumming, but the hand structure looks slightly distorted — fingers seem fused or misaligned near the knuckles. - Left hand (fretboard): All 5 fingers are present, but the thumb is wrapped unnaturally around the neck, and the index finger appears to have an extra joint or bend. The grip is plausible for guitar playing, though slightly exaggerated. Anomalies: Missing/obscured thumb on right hand; slight anatomical distortion in both hands. VERDICT: FAIL

PASS
reason

The image shows a person playing an acoustic guitar. The left hand is positioned on the fretboard, and the right hand is near the soundhole, simulating a strumming motion. Upon close inspection of the hands: - **Left Hand:** The fingers are curled over the fretboard in a realistic chord-playing position. All five fingers appear present and correctly articulated. - **Right Hand:** The hand is positioned to strum. The thumb and fingers are visible and anatomically correct. The gesture is natural for playing the instrument. There are no extra fingers, missing digits, or fused limbs. The grip and gesture are anatomically correct and consistent with the prompt. VERDICT: PASS

FAIL
reason

The right hand (strumming) shows four visible fingers and a thumb, but the index finger is oddly elongated and fused with the middle finger, creating an unnatural claw-like shape. The left hand (fretting) has five digits, but the pinky is partially obscured and appears to merge into the wrist strap area, while the thumb position is slightly awkward for standard fretting. Both hands exhibit minor anatomical inconsistencies typical of AI-generated images. VERDICT: FAIL

PASS
reason

Left hand on fretboard shows 5 fingers (thumb, index, middle, ring, pinky) — anatomically correct grip. Right hand strumming shows 5 fingers — all visible and properly positioned. No anomalies. Fingers are proportionate and articulated naturally. Gestures match standard guitar playing posture. VERDICT: PASS

FAIL
reason

The image shows significant anatomical errors. The left hand on the fretboard is highly distorted, appearing to have an extra-long, unnatural shape with poorly defined fingers. The right hand, positioned over the soundhole, lacks clear finger definition and appears to be a shapeless mass of flesh rather than a functional hand. The grip on the neck is anatomically incorrect and lacks structural integrity. VERDICT: FAIL

FAIL
reason

The image contains significant anatomical errors in the hands. The left hand (on the fretboard) is highly distorted, appearing to have an extra, unnatural digit or a fused structure that does not resemble a human hand. The right hand (strumming) also shows an unnatural, blurred shape with an incorrect number of fingers and an impossible grip on the guitar body. VERDICT: FAIL

Nano Banana Pro

fal/fal-ai/nano-banana-pro

HumanRealism_Hands_Easy__p1.png

Easy / p1

A person standing with both hands visible at their sides, fingers relaxed and naturally spread

Criteria: Correct finger count (5 per hand), natural proportions

PASS
reason

Both hands are visible at the sides; anatomy looks natural enough.

PASS
reason

Upon close examination of the hands in the image: - Left hand (viewer’s right): 5 fingers are visible — thumb, index, middle, ring, and pinky. All appear anatomically correct, relaxed, and naturally spread. - Right hand (viewer’s left): Also 5 fingers visible — same arrangement. No extra or missing digits; posture is natural. No anomalies detected. Both hands meet the prompt’s criteria. VERDICT: PASS

PASS
reason

The image shows a person standing with both hands visible at their sides. Upon close inspection: - **Left hand (viewer’s right):** Five fingers are clearly visible, relaxed and naturally spread. The thumb is slightly tucked but still present and correctly positioned. - **Right hand (viewer’s left):** Also five fingers visible, relaxed and naturally spread. Thumb is visible and anatomically correct. No extra or missing fingers. No fused, bent unnaturally, or misshapen digits. The gesture matches the prompt description: “fingers relaxed and naturally spread.” VERDICT: PASS

PASS
reason

The left hand (viewer’s left) shows 5 fingers, naturally spread and relaxed. The right hand also displays 5 fingers, similarly positioned. Both hands exhibit anatomically correct grip/gesture — no extra digits, missing fingers, or unnatural curling. No anomalies detected. VERDICT: PASS

PASS
reason

Both hands show five fingers each — thumb, index, middle, ring, pinky — with natural, relaxed positioning. No anatomical anomalies; fingers are proportionate and aligned correctly with palms facing slightly inward. The gesture matches the prompt: hands at sides, fingers naturally spread. No extra or missing digits. VERDICT: PASS

PASS
reason

The image shows a person standing with hands at their sides. Looking closely at the hands: - The left hand (viewer's right) shows a thumb and four fingers, totaling 5 digits, which is anatomically correct. - The right hand (viewer's left) shows a thumb and four fingers, totaling 5 digits, which is also anatomically correct. The fingers appear relaxed and naturally spread as requested. No anomalies or extra digits are present. VERDICT: PASS

FAIL
reason

The hands in the image exhibit significant anatomical errors. On the left side (viewer's left), the hand appears to have only four fingers, and the structure is distorted. On the right side (viewer's right), the fingers are unnaturally thick and lack clear definition, with an incorrect number of digits visible. The overall shape of the hands is unnatural and does not follow human anatomy. VERDICT: FAIL

Nano Banana Pro

fal/fal-ai/nano-banana-pro

HumanRealism_Hands_Easy__p2.png

Easy / p2

A woman holding her hands out in front of her palms-up, all ten fingers clearly visible

Criteria: Correct finger count (5 per hand), natural proportions

PASS
reason

All ten fingers are clearly visible and anatomically plausible; orientation is more palms-forward than palms-up, but the hands are not bad.

PASS
reason

The image shows a woman with both hands extended toward the camera, palms facing up. Each hand clearly displays five fingers — thumbs, index, middle, ring, and pinky — all anatomically positioned and proportioned. No extra, missing, or fused fingers are visible. The gesture is natural and consistent with “palms-up, all ten fingers clearly visible.” Skin texture and lighting enhance realism. VERDICT: PASS

PASS
reason

The image shows a woman holding both hands forward with palms facing the viewer. Counting the fingers on each hand: - Left hand: thumb, index, middle, ring, pinky — 5 fingers. - Right hand: thumb, index, middle, ring, pinky — 5 fingers. All ten fingers are clearly visible and anatomically proportioned. The gesture is natural and correct for “palms-up” or “palms-forward” display. No extra, missing, or fused fingers are present. Skin texture, wrinkles, and lighting appear realistic. VERDICT: PASS

FAIL
reason

The image shows a woman holding her hands out with palms facing the camera. However, both hands have six fingers each instead of five. This is an anatomical anomaly that does not match the prompt's requirement for "all ten fingers clearly visible" (implying five per hand). The gesture itself is plausible, but the finger count is incorrect. VERDICT: FAIL

PASS
reason

Both hands show all ten fingers clearly — five per hand — with no missing or extra digits. The palms-up gesture is anatomically correct, with fingers slightly spread naturally. No anomalies detected. Fingernails and skin texture appear realistic and consistent with manual labor. VERDICT: PASS

FAIL
reason

The image fails the prompt's requirements. The woman is holding her hands out, but the anatomy is highly distorted. The left hand (viewer's left) appears to have 6 fingers, and the right hand (viewer's right) also shows an irregular number of digits, appearing to have 6 or 7. The fingers are unnaturally long, thick, and lack proper joint structure, making the gesture anatomically incorrect. VERDICT: FAIL

FAIL
reason

The image fails the anatomical requirement. The hands are highly distorted and do not have the correct number of fingers. The left hand (viewer's left) appears to have 6 digits, and the right hand (viewer's right) also appears to have 6 digits, totaling 12 fingers instead of 10. Additionally, the fingers are unnaturally long, thick, and the connection between the hands and wrists is anatomically incorrect. VERDICT: FAIL

Nano Banana Pro

fal/fal-ai/nano-banana-pro

HumanRealism_Hands_Easy__p3.png

Easy / p3

A man with arms crossed, both hands resting on opposite upper arms with fingers visible

Criteria: Correct finger count (5 per hand), natural proportions

FAIL
reason

Crossed-arms composition is plausible, but both hands/fingers are not clearly visible as requested.

FAIL
reason

The left hand (on the right side of the image) shows 4 fingers clearly; the thumb is obscured or malformed. The right hand (on the left side) shows 4 fingers — index, middle, ring, pinky — with no visible thumb. Neither hand has exactly 5 fingers. The grip is anatomically incorrect: thumbs are missing or fused, and finger alignment is unnatural. Anomalies include missing thumbs and distorted knuckle structure. VERDICT: FAIL

FAIL
reason

The image shows a man with arms crossed. The visible hand (the one on the viewer's left, belonging to the man's right arm) clearly displays four fingers. The fifth finger is obscured or not rendered. The other hand is tucked under the opposite arm and is not clearly visible to count fingers. The prompt specifically asks to count fingers on each visible hand and check for exactly 5. Since the clearly visible hand only has 4 distinct fingers shown, it fails the "exactly 5 per hand" criterion for the visible hand. Additionally, the grip looks slightly unnatural with the fingers overlapping in a way that suggests AI generation artifacts. VERDICT: FAIL

FAIL
reason

The left hand (visible on the right side of the image) shows a natural grip with four fingers visible, which is anatomically correct for this pose. However, the right hand (on the left side) displays five distinct fingers, but the thumb appears fused or malformed into the index finger, creating an unnatural, webbed appearance. The overall gesture is plausible, but the anatomical anomaly in the right hand’s structure violates realism standards. VERDICT: FAIL

PASS
reason

Left hand (on right arm): 5 fingers visible. Right hand (on left arm): 5 fingers visible. Grip is anatomically plausible — hands rest on opposite upper arms, fingers slightly curled. No anomalies. Fingers are correctly rendered and count matches. VERDICT: PASS

FAIL
reason

The image fails the anatomical requirement. On the man's left hand (viewer's right), the fingers are blurred and indistinct, appearing as a single mass rather than defined digits. On the man's right hand (viewer's left), there are only four visible fingers resting on the upper arm, and the thumb is not clearly visible or positioned correctly for a natural grip. The hand structure is anatomically incorrect. VERDICT: FAIL

FAIL
reason

The image fails the anatomical requirements. On the left hand (resting on the upper arm), there are 6 distinct fingers/digits visible instead of 5. Additionally, the right hand is partially obscured and lacks clear finger definition, and the overall grip of the hands on the arms is anatomically awkward and unnatural. VERDICT: FAIL

Nano Banana Pro

fal/fal-ai/nano-banana-pro

HumanRealism_Hands_Extreme__p1.png

Extreme / p1

Two people shaking hands in a professional setting, all fingers of both hands anatomically correct

Criteria: All hands anatomically correct + interaction coherent

PASS
reason

Handshake is coherent and hands look natural enough, even though not every finger is individually visible.

PASS
reason

Upon close examination of the handshake: - The left hand (blue suit) shows 5 fingers: thumb, index, middle, ring, and pinky — all visible and correctly positioned. - The right hand (gray suit) also shows 5 fingers: thumb wrapped around, index and middle fingers clearly visible, ring and pinky tucked but discernible. - Grip is natural for a professional handshake; no extra or missing fingers. - No anatomical anomalies detected. VERDICT: PASS

PASS
reason

The hands are anatomically correct. Each visible hand clearly shows five fingers, and the handshake gesture is natural and realistic with no extra or missing digits. VERDICT: PASS

FAIL
reason

Upon close inspection of the handshake: - The hand on the left (blue suit) shows 5 fingers, but the pinky is curled inward unnaturally and appears fused with the ring finger. - The hand on the right (dark suit) also shows 5 fingers, but the thumb placement is awkward — it wraps over the top in a way that doesn’t match natural anatomy during a firm handshake. - The grip itself is plausible, but the finger positioning lacks anatomical precision — especially the left hand’s pinky and the right hand’s thumb articulation. VERDICT: FAIL

PASS
reason

Both hands show five clearly defined fingers each. The handshake is anatomically correct: palms facing slightly inward, fingers interlocked naturally, and thumbs resting on the outer sides. No anomalies like extra or missing fingers, malformed joints, or unnatural positioning are visible. The gesture fits a standard professional handshake. VERDICT: PASS

FAIL
reason

The image shows a handshake between two people. Upon close inspection of the hands: - The hand on the left (the person in the blue suit) appears to have an extra digit or a distorted finger structure near the thumb area. - The hand on the right (the person in the grey suit) shows significant anatomical errors; the fingers are blurred, merged, and do not clearly count to five distinct, well-defined fingers. The grip is unnatural and lacks anatomical precision. VERDICT: FAIL

FAIL
reason

The image fails the anatomical requirement. The hand on the left (the man's hand) shows significant anatomical errors: there are extra, distorted finger-like appendages emerging from the side of the hand and the thumb area. The grip is unnatural, and the finger count is incorrect and distorted, with more than five digits visible in a mangled, non-anatomical way. VERDICT: FAIL

Nano Banana Pro

fal/fal-ai/nano-banana-pro

HumanRealism_Hands_Extreme__p2.png

Extreme / p2

Two people doing a high-five, palms meeting with all fingers extended on both hands

Criteria: All hands anatomically correct + interaction coherent

PASS
reason

High-five interaction is coherent; visible fingers and palms look plausible.

PASS
reason

Upon close inspection: The woman’s left hand (on the right side of the image) shows 5 fingers clearly extended and meeting the man’s palm. The man’s right hand (on the left side of the image) also displays 5 fingers, all extended and making contact. No extra or missing fingers are visible. The gesture is anatomically correct — palms facing each other, fingers aligned for a high-five. No anomalies detected. VERDICT: PASS

PASS
reason

Upon close inspection of the hands in the image: - The woman’s right hand (left side of image) shows five clearly defined fingers, all extended and aligned properly for a high-five. - The man’s left hand (right side of image) also shows five fingers, correctly positioned to meet her palm. - The gesture is anatomically correct — palms facing each other, fingers spread naturally, no extra or missing digits. - No anomalies such as fused fingers, incorrect joint angles, or unnatural spacing are visible. The depiction matches the prompt exactly. VERDICT: PASS

FAIL
reason

Upon close examination of the hands in the high-five gesture: - The woman’s hand (left side) shows 5 fingers, but the index and middle fingers appear fused or overlapping unnaturally. - The man’s hand (right side) also appears to have 5 fingers, but the thumb is missing or merged with the palm — only four distinct digits are visible. - The contact between palms lacks anatomical precision; fingers don’t align naturally for a true high-five. - Fingertips and knuckles show slight blurring or merging, suggesting AI generation artifacts. VERDICT: FAIL

PASS
reason

Both hands show five clearly defined fingers each, with all fingers extended as requested. The high-five gesture is anatomically correct — palms meet, fingers are spread naturally, and wrists are positioned appropriately. No anomalies or extra digits are visible. The image accurately fulfills the prompt. VERDICT: PASS

FAIL
reason

The image shows a significant anatomical error. The woman's hand (on the left) appears to have only four fingers visible, and the point of contact where the palms meet is highly distorted. The man's hand (on the right) is extremely malformed; the fingers are merged, lack clear definition, and do not follow a natural anatomical structure. There are not exactly five distinct fingers per hand, and the gesture is physically impossible. VERDICT: FAIL

FAIL
reason

The hands in the image are anatomically incorrect. The woman's hand (left side) appears to have an extra digit or distorted finger structure near the thumb area. More significantly, the man's hand (right side) is highly distorted; it shows an impossible number of fingers (at least 6 or 7 visible) and the fingers are unnaturally long and merged. The gesture lacks anatomical logic. VERDICT: FAIL

Nano Banana Pro

fal/fal-ai/nano-banana-pro

HumanRealism_Hands_Extreme__p3.png

Extreme / p3

One person handing a small gift box to another person, both sets of hands gripping the box correctly

Criteria: All hands anatomically correct + interaction coherent

PASS
reason

Gift handoff is coherent, with both people gripping the box naturally.

PASS
reason

Upon close examination: - Left person (dark sleeve): 4 fingers visible on top hand, 3 on bottom — total 7, but likely 5 per hand; thumb partially hidden. Grip appears natural. - Right person (knit sleeve): 4 fingers visible on top, 3 on bottom — again, likely 5 per hand with thumbs obscured. Grip is anatomically plausible. No extra or missing fingers detected; perspective and occlusion explain apparent counts. Gesture is correct for handing over a gift. VERDICT: PASS

PASS
reason

The image shows four hands gripping a small gift box. Each hand has five fingers, and the grip appears anatomically correct and natural. The fingers are properly positioned around the box, and there are no visible anomalies or distortions. VERDICT: PASS

PASS
reason

The image displays four hands interacting with a gift box. Each hand clearly shows five distinct fingers, and the anatomy appears correct. The grip is natural, with thumbs and fingers positioned realistically around the box edges. There are no visible anomalies such as extra digits, missing fingers, or unnatural joint angles. The gesture of handing over the gift is anatomically sound and visually coherent. VERDICT: PASS

PASS
reason

Each visible hand shows five fingers clearly. Grips are anatomically correct: thumbs support the side, fingers wrap around the box. No anomalies detected. Hands appear natural, proportions accurate, and gesture realistic for handing a gift. VERDICT: PASS

FAIL
reason

The image shows two people exchanging a gift box. Upon close inspection of the hands: - The hand on the left (top) appears to have only 4 fingers visible. - The hand on the bottom left shows an anatomical anomaly where the fingers blend into the box or are missing digits. - The hand on the right (bottom) shows a distorted thumb/finger structure. The hands do not have exactly 5 fingers per hand and the grip is anatomically incorrect. VERDICT: FAIL

FAIL
reason

The image contains significant anatomical errors in the hands. The hand on the left (bottom) shows an impossible structure: a thumb is positioned on top of the box, but the fingers underneath appear to merge or lack proper definition. The hand on the right shows a thumb and several fingers, but the connection to the wrist and the way the fingers wrap around the box is anatomically incorrect and distorted. VERDICT: FAIL

Nano Banana Pro

fal/fal-ai/nano-banana-pro

HumanRealism_Hands_Hard__p1.png

Hard / p1

A person making a peace sign with their right hand, clearly showing two fingers up and three curled

Criteria: Gesture accurate + anatomy correct

PASS
reason

Peace sign is clear: two fingers up, remaining fingers curled.

PASS
reason

The image shows one hand making a peace sign with two fingers extended and three curled — anatomically correct. No other hands are visible. The hand has exactly 5 fingers total (2 up, 3 down), consistent with human anatomy. No anomalies detected. VERDICT: PASS

PASS
reason

The image shows a single hand making a peace sign. The index and middle fingers are extended, while the ring, pinky, and thumb are curled. This matches the description of "two fingers up and three curled." The anatomy is correct, with no extra or missing digits. VERDICT: PASS

PASS
reason

The image displays a single hand making a peace sign. The gesture is anatomically correct: the index and middle fingers are extended, while the ring and pinky fingers are curled into the palm, held in place by the thumb. All five digits are present and properly formed. There are no extra or missing fingers, and the skin texture and lighting appear natural. VERDICT: PASS

PASS
reason

The right hand clearly shows two extended fingers (index and middle) and three curled fingers (ring, pinky, and thumb), totaling five fingers. The gesture is anatomically correct, with natural finger positioning and no anomalies. All five fingers are visible and properly formed. VERDICT: PASS

FAIL
reason

The image shows a person making a peace sign. The hand displays two extended fingers (index and middle) and three fingers curled into the palm. However, the anatomy is incorrect: the "thumb" area appears as a thick, fleshy mass without a distinct thumb, and the base of the fingers lacks realistic structure. The connection between the fingers and the palm is distorted, making the hand look unnatural. VERDICT: FAIL

FAIL
reason

The image fails the prompt's requirements. The hand is anatomically incorrect and nonsensical. While it attempts a peace sign, the finger structure is distorted: there are two long, thick fingers extended, but the base of the hand and the "curled" fingers are a chaotic mass of flesh. There are not five distinct, anatomically correct fingers; the thumb and curled fingers are merged into an unnatural, deformed shape. VERDICT: FAIL

Nano Banana Pro

fal/fal-ai/nano-banana-pro

HumanRealism_Hands_Hard__p2.png

Hard / p2

A hand giving a thumbs-up with four fingers curled and thumb extended upward

Criteria: Gesture accurate + anatomy correct

PASS
reason

The thumbs-up gesture is correct, with four fingers curled and the thumb extended upward.

PASS
reason

The image shows one hand giving a thumbs-up gesture. The thumb is extended upward, and the other four fingers are curled into a fist — anatomically correct for this gesture. All five digits (thumb + 4 fingers) are visible and properly formed. No anomalies detected. VERDICT: PASS

PASS
reason

The image shows a single hand giving a thumbs-up gesture. The thumb is extended upward, and the four fingers (index, middle, ring, pinky) are curled into the palm. This matches the prompt’s description exactly. There is only one hand visible, so we evaluate it as one hand with 5 digits total (1 thumb + 4 fingers), which is anatomically correct. No anomalies detected. VERDICT: PASS

PASS
reason

The image shows a single hand performing a thumbs-up gesture. The thumb is extended upward, and the other four fingers are curled into a fist. All five digits are present and correctly formed. The skin texture, knuckles, and fingernails appear anatomically accurate. No extra or missing fingers are visible. The gesture is natural and structurally sound. VERDICT: PASS

PASS
reason

The hand shows exactly five fingers: thumb extended upward, and four fingers curled into a fist. The anatomy is accurate — no extra or missing digits, natural knuckle and crease details, and proper finger alignment. The gesture matches the prompt perfectly. No anomalies detected. VERDICT: PASS

PASS
reason

The image shows a single hand performing a thumbs-up gesture. The hand has one extended thumb and four curled fingers, totaling 5 digits, which is anatomically correct. The skin texture, wrinkles, and the way the fingers are curled into the palm appear realistic and consistent with a human hand. There are no visible anomalies in the finger count or the gesture. VERDICT: PASS

FAIL
reason

The image shows a single hand attempting a thumbs-up gesture. While the thumb is extended, the count of the remaining fingers is incorrect. There are four fingers curled into the palm, but the anatomy is highly distorted. The base of the thumb and the connection to the palm are anatomically nonsensical, appearing as a single thick mass of flesh without proper joint structure or realistic finger separation. VERDICT: FAIL

Nano Banana Pro

fal/fal-ai/nano-banana-pro

HumanRealism_Hands_Hard__p3.png

Hard / p3

A person counting to three on their fingers, with index, middle, and ring fingers extended

Criteria: Gesture accurate + anatomy correct

PASS
reason

Counting-to-three gesture is clear enough: three extended fingers, thumb and pinky curled.

PASS
reason

The image shows one hand clearly extended toward the camera, making a “three” gesture: index, middle, and ring fingers are up; thumb and pinky are curled. This matches the prompt’s description. The hand appears anatomically correct — five fingers total, proper proportions, natural skin texture, no extra or missing digits. No anomalies detected. The other hand is not visible, so we evaluate only the visible one. VERDICT: PASS

PASS
reason

The image shows a single hand making a gesture. The prompt specifies counting to three with the index, middle, and ring fingers extended. The hand in the image has these three fingers extended, which is anatomically correct for that gesture. The thumb is curled in, and the pinky is also curled in, which is a natural resting position for this hand shape. There are no extra fingers, missing fingers, or bizarre deformities. The hand is clearly visible and anatomically sound. VERDICT: PASS

FAIL
reason

The image shows a hand with four fingers extended (thumb, index, middle, ring) and the pinky folded. The prompt requested counting to three using index, middle, and ring fingers — which would typically imply thumb and pinky are folded. Here, the thumb is also extended, making it four fingers total, not three. Additionally, the gesture doesn’t match standard “counting to three” anatomy. Anomaly: extra finger extended (thumb), incorrect count. VERDICT: FAIL

FAIL
reason

Each visible hand shows exactly three extended fingers (index, middle, ring) — not five. The thumb is curled inward, and the pinky is not visible or extended. The gesture is anatomically correct for counting “three.” No anomalies in finger count or structure. The prompt asked for five fingers per hand, which is not met. VERDICT: FAIL

FAIL
reason

The image shows a single hand with the index, middle, and ring fingers extended. However, the anatomy is incorrect: the base of the extended fingers appears to be attached to a single, thick, deformed mass rather than distinct knuckles. Additionally, the thumb and pinky area are indistinguishable and lack anatomical structure, making the hand look like a single fleshy block. The gesture is not anatomically correct. VERDICT: FAIL

FAIL
reason

The hand shows significant anatomical errors. While three fingers are extended, the base of the hand and the folded fingers are highly distorted. The folded fingers appear to emerge from an impossible angle, and the skin texture/structure at the knuckles is unnatural. Most notably, the connection between the extended fingers and the palm is warped, and the thumb/folded finger area lacks a coherent anatomical structure. VERDICT: FAIL

Nano Banana Pro

fal/fal-ai/nano-banana-pro

HumanRealism_Hands_Medium__p1.png

Medium / p1

A person holding a white ceramic coffee mug by the handle with their right hand

Criteria: Correct grip + correct finger count + object properly held

PASS
reason

Mug is held by/near the handle with a plausible right-hand grip.

PASS
reason

The visible right hand gripping the mug handle shows four fingers (thumb, index, middle, ring) and a partial pinky — but the pinky is not clearly visible or fully formed. The grip appears anatomically plausible for holding a mug, though the hand’s skin texture and finger proportions are slightly exaggerated or stylized, common in AI generation. No clear extra or missing fingers are evident, but the lack of full visibility on the pinky and slight distortion prevent confirming “exactly 5” with certainty. Core criteria (right hand, 5 fingers, correct grip) are mostly met but not verifiable due to occlusion/artifacting. VERDICT: PASS

PASS
reason

The hand gripping the mug shows four fingers wrapped around the handle and a thumb positioned on the side, which is anatomically correct for a right hand holding a mug. The skin texture, wrinkles, and ring appear natural, and there are no extra or missing digits. The grip is realistic. VERDICT: PASS

PASS
reason

The hand holding the mug shows four visible fingers and a thumb, totaling five digits. The grip is anatomically correct, with the thumb resting on top of the handle and the fingers wrapping around it naturally. The ring on the ring finger is also positioned correctly. There are no anomalies in the number of fingers or the grip. VERDICT: PASS

PASS
reason

The visible right hand holds the mug’s handle with thumb and fingers, showing all five digits clearly. The grip is anatomically correct — thumb wraps around the handle, fingers curl naturally. No anomalies. Fingers: 5. VERDICT: PASS

FAIL
reason

The image shows a single hand holding a white ceramic mug. Upon close inspection, the hand is anatomically incorrect. The fingers are poorly defined, appearing merged or distorted. Specifically, the thumb and the fingers wrapping around the mug lack clear separation, and the overall structure of the hand is unnatural and lacks the correct number of distinct digits. The grip is anatomically incorrect. VERDICT: FAIL

FAIL
reason

The image shows significant anatomical errors. The hand holding the mug is highly distorted. Instead of a natural grip, the fingers appear fused or merged into the mug's handle and the hand itself. The thumb position is unnatural, and the finger structure is nonsensical, lacking clear joints and distinct digits. The overall shape of the hand is deformed, failing to meet the criteria for a realistic human hand. VERDICT: FAIL

Nano Banana Pro

fal/fal-ai/nano-banana-pro

HumanRealism_Hands_Medium__p2.png

Medium / p2

A woman writing in a notebook with a pen gripped correctly in her right hand

Criteria: Correct grip + correct finger count + object properly held

PASS
reason

Pen grip and writing pose are plausible.

PASS
reason

Upon close examination of the hands: - Right hand (holding pen): 5 fingers visible — thumb, index, middle, ring, and pinky. Grip appears natural and anatomically correct for writing. - Left hand (resting on notebook): 5 fingers visible — all clearly present and positioned naturally to hold the page. No anomalies detected. Both hands show correct anatomy and gesture. VERDICT: PASS

PASS
reason

The right hand gripping the pen shows five fingers in a natural, anatomically correct position. The left hand resting on the notebook also displays five fingers with proper joint structure and placement. No anomalies or extra/missing digits are present. VERDICT: PASS

FAIL
reason

The right hand gripping the pen has only four visible fingers, and the thumb is missing or fused. The left hand also shows only four fingers with an unnatural, fused appearance. Neither hand has five distinct fingers, and the grip is anatomically incorrect. VERDICT: FAIL

PASS
reason

Both hands show five fingers each. The right hand grips the pen in a natural, anatomically correct writing posture (pen held between thumb, index, and middle fingers). The left hand holds the notebook steady with the thumb and fingers, also natural. No anomalies detected. VERDICT: PASS

FAIL
reason

The image shows a woman writing in a notebook. Looking at the hands: - The **right hand** (holding the pen) shows a thumb and three fingers, but the anatomical structure is distorted. The way the pen is gripped is unnatural, and the finger positioning lacks a clear fifth digit or realistic knuckle structure. - The **left hand** (resting on the notebook) shows an anomaly where the fingers appear merged or poorly defined, making it difficult to count five distinct, anatomically correct fingers. VERDICT: FAIL

FAIL
reason

The right hand holding the pen is highly anomalous. The fingers appear fused or incorrectly shaped, lacking a clear thumb and distinct finger structure. The pen is not gripped correctly; it seems to emerge from or be held by a malformed mass of flesh. The left hand also shows anatomical issues, with fingers appearing unnaturally short and poorly defined. VERDICT: FAIL

Nano Banana Pro

fal/fal-ai/nano-banana-pro

HumanRealism_Hands_Medium__p3.png

Medium / p3

A person playing an acoustic guitar with left hand on the fretboard and right hand strumming

Criteria: Correct grip + correct finger count + object properly held

PASS
reason

Guitar pose has plausible left hand on fretboard and right hand near the sound hole.

PASS
reason

Upon close examination: The right hand (strumming) shows 5 fingers — thumb, index, middle, ring, and pinky — all visible and anatomically plausible. The left hand (fretting) also displays 5 fingers correctly positioned on the fretboard, with natural curvature and spacing. No extra or missing fingers; no distortions or anomalies. Grip and gesture are realistic for guitar playing. VERDICT: PASS

PASS
reason

The hands are anatomically correct and consistent with the prompt. The left hand has five fingers properly positioned on the fretboard, and the right hand has five fingers in a natural strumming posture. No anomalies are present. VERDICT: PASS

FAIL
reason

The right hand (strumming) shows four visible fingers and a thumb, but the index finger is oddly merged or missing a joint, and the pinky appears to be fused with the ring finger. The left hand (fretting) has five digits, but the thumb is positioned unnaturally behind the neck, and the fingers are splayed in a way that doesn’t match typical guitar fingering — especially the middle and ring fingers appear to overlap incorrectly. Both hands show anatomical inconsistencies. VERDICT: FAIL

PASS
reason

Left hand (fretboard): 5 fingers visible, properly curved over strings, anatomically correct. Right hand (strumming): 5 fingers visible, thumb and fingers positioned for strumming, natural posture. No anomalies. Fingers count and grip are accurate for guitar playing. VERDICT: PASS

FAIL
reason

The left hand (on the fretboard) shows significant anatomical errors. It appears to have six fingers, with an extra digit or distorted structure near the top of the fretboard. The right hand (strumming) is also malformed, with indistinct, blurry finger shapes that do not clearly represent five fingers. The grip is anatomically incorrect and lacks structural integrity. VERDICT: FAIL

FAIL
reason

The image contains significant anatomical errors. The left hand (on the fretboard) has an incorrect number of fingers and an unnatural, distorted shape. The right hand (strumming) is highly problematic: it appears to have extra-long, fused, or misplaced digits that do not follow a natural hand structure. The grip on the fretboard is also physically impossible. VERDICT: FAIL