• ✓Bipedal, back horizontal, tail held straight out off the ground
• ✕Palms facing each other, not turned down or danglingมือคว่ำลง กรงเล็บชี้ลงไปข้างหน้า
• ✓Three weight-bearing toes on each foot
• ✓Long, narrow crocodile-like snout, conical teeth, nostrils set back toward the eyes
• ✓No sail on the back, at most a low ridge or hump
• ✓Strong arms with a huge curved thumb claw, long sturdy hind legs, an ordinary long 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 31, 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 Irritator, a carnivore Spinosauridae dinosaur from the Albian age of the Early Cretaceous (about 113–110 million years ago). Bipedal with the back held roughly horizontal and the tail held straight out behind for balance, never dragging on the ground. NOT standing upright like a kangaroo. Hands held tucked in near the chest with the palms facing inward toward each other, like clapping, claws curving inward and forward. NOT hanging down, NOT palms-down, NOT claws pointing at the ground. A long, narrow, crocodile-like snout with conical teeth and nostrils set far back near the eyes, NOT a deep tyrannosaur-like skull. NO sail on the back, at most a low ridge or hump along the middle of the back. Reference: Irritator is a genus of spinosaurid dinosaur that lived in what is now Brazil during the Albian stage of the Early Cretaceous Period, about 113 to 110 million years ago. It is known from a nearly complete skull found in the Romualdo Formation of the Araripe Basin. Fossil dealers had acquired this skull and sold it to the State Museum of Natural History Stuttgart. Anatomy: three main weight-bearing toes on each foot; strong arms with a huge curved claw on each thumb, long sturdy hind legs, an ordinary long tail. Full body in side view, whole animal visible, standing in the shore of an Early Cretaceous coastal lagoon in northeastern Brazil, like the Romualdo Formation, with fish in the shallow water and conifers and ferns on the bank, 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