• ✓Bipedal, back horizontal, tail held straight out off the ground
• ✓Mouth closed, lips covering the teeth so none are visible
• ✕Palms facing each other, not turned down or danglingHands dangle with claws pointing down
• ✓Three weight-bearing toes on each foot
• ✓Long, low, slender skull, not deep and massive like T. rexหัวยาวต่ำเพรียวถูกต้อง แต่เห็นปุ่มหน้าตาไม่ชัด
• ✕Slender mid-sized predator about 5 m long, long legs, fairly large arms with two big fingersมือข้างที่เห็นมีกรงเล็บ 3 นิ้ว ไม่ใช่ 2 นิ้ว
• ✓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 Nanotyrannus, a carnivore Nanotyrannidae dinosaur from the end of the Maastrichtian, at the very end of the Cretaceous (about 67–66 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. Mouth closed with all teeth fully hidden behind scaly lips, like a monitor lizard. NO visible teeth. A long, low, slender skull with small bony crests in front of the eyes, NOT the deep, massive skull of Tyrannosaurus. Reference: Nanotyrannus is a genus of tyrannosauroid dinosaur that lived in what is now western North America during the Maastrichtian age of the Late Cretaceous, 67 to 66 million years ago. Its fossils are mainly known from the Hell Creek Formation. It was one of the last-known non-avian dinosaurs and lived until the Cretaceous–Paleogene extinction event. Anatomy: hands held with palms facing each other (not pronated, not palms-down, not dangling); three main weight-bearing toes on each foot; a slender, mid-sized predator about 5 meters long with long running legs and relatively large arms with two big clawed fingers. Full body in side view, whole animal visible, standing in a humid latest-Cretaceous floodplain forest like the Hell Creek Formation of North America, with conifers, ferns and early flowering trees and shrubs, 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