• ✓Body horizontal, head low at hip height, tail straight in line with the back
• ✓Mouth closed, lips covering the teeth so none are visible
• ✕Palms facing each other, not turned down or danglingHands dangle below the wing feathers
• ✓Long, low, narrow snout, not a beak or rounded bird head
• ✓Short S-curved neck, not a long ostrich neck
• ✓Arms folded at the sides with wing feathers and visible clawed fingers
• ✓Stiff, straight tail fringed with feathers and fanned at the tip
• ✓Visible, proportionate sickle claw on the second toe, held off the ground
• ✕Feathered body, about 6 m long and heavily builtStill slender, not as heavily built as the prompt asked
• ✓Whole animal visible in side view
• ✓Scene matches the period and the fossil site
• ✓No text, people or modern objects

Checked by Claude Opus 5.5 (checked item by item from the image) on Oct 28, 2026. The score is the share of checklist items the image gets right; it is not an expert scientific review.

Prompt used to create the image

Scientifically accurate paleoart of Utahraptor, a carnivore Dromaeosauridae dinosaur from the Early Cretaceous (about 139–135 million years ago). Walking with the whole body held horizontal and balanced over the hips like a seesaw, back parallel to the ground, head held low and forward at the same height as the hips, short neck curving forward rather than upward, long stiff tail extended straight back in line with the back. NOT standing upright, NOT a raised head, NOT an ostrich or kangaroo posture. Mouth closed with all teeth fully hidden behind scaly lips, like a monitor lizard. NO visible teeth. Reference: Utahraptor is a genus of large dromaeosaurid dinosaur that lived during the Early Cretaceous period from around 139 to 135 million years ago in what is now the United States. The genus was described in 1993 by American paleontologist James Kirkland and colleagues with the type species Utahraptor ostrommaysi, based on fossils that had been unearthed earlier from the Cedar Mountain Formation of Utah. Later, many additional specimens were described including those from the skull and postcranium in addition to those of younger individuals. Anatomy: hands held with palms facing each other (not pronated, not palms-down, not dangling); a long, low, narrow snout with a slightly upturned profile, NOT a bird beak and NOT a rounded bird head; a short S-curved neck about as long as the skull, NOT a long ostrich neck; clearly visible arms folded at the sides of the body like a bird's wings, with long pennaceous feathers attached along the forearm and hand, and three separate clawed fingers visible at the end of each hand; a stiff, straight tail fringed with feathers along its sides and a fan of feathers at the tip; each foot has a clearly visible sickle-shaped claw on the second toe, retracted and held off the ground, proportionate in size and attached to the toe; body covered in short feathers, about 6 meters long, heavily built and robust with thick legs. Full body in side view, whole animal visible, standing in an Early Cretaceous semi-arid plain like the Cedar Mountain Formation of Utah, with conifers, cycads and ferns, no grass and no flowering plants. Natural history museum illustration style, realistic textures and natural daylight, muted natural colors. No text, no labels, no humans, no modern objects.

Facts in the prompt come from Wikipedia (en) and Paleobiology Database