• ✓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 groundSickle claw not clearly visible
• ✓Feathered body, about 3.4 m long including the tail
• ✓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 Deinonychus, a carnivore Dromaeosauridae dinosaur from the Early Cretaceous (about 115–108 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: Deinonychus is a genus of dromaeosaurid theropod dinosaur with one described species, Deinonychus antirrhopus. This species, which could grow up to 3.4 meters (11 ft) long, lived during the Early and Late Cretaceous Period, about 115–98 million years ago. Fossils have been recovered from the U.S. states of Montana, Utah, Wyoming, and Oklahoma, in rocks of the Cloverly Formation and Antlers Formation, though teeth that may belong to Deinonychus have been found much farther east in Maryland. 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 3.4 meters long including the tail, the size of a large wolf. Full body in side view, whole animal visible, standing in an Early Cretaceous floodplain like the Cloverly Formation of Montana, with conifers, cycads, tree ferns and ferns, no grass. 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