• ✓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 dangling
• ✓Three weight-bearing toes on each foot
• ✓Tall, thick muscular ridge along the neck, back and hips, not a thin sailสันหลังหนาต่อเนื่องจากคอถึงหาง
• ✓Long, low, narrow skull, not broad and deep like T. rex
• ✓Huge, 11–12 m long, short three-fingered arms, small scales
• ✓Whole animal visible in side view
• ✕Scene matches the period and the fossil siteมีต้นปาล์มสูง ซึ่งยังไม่มีในช่วงต้นครีเทเชียส
• ✓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 Acrocanthosaurus, a carnivore Carcharodontosauridae dinosaur from the Aptian–Albian ages 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. Mouth closed with all teeth fully hidden behind scaly lips, like a monitor lizard. NO visible teeth. 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 tall, thick ridge of muscle running along the neck, back and hips over its long neural spines, NOT a thin sail. A long, low, narrow skull with blade-like teeth, NOT the broad deep skull of Tyrannosaurus. Reference: Acrocanthosaurus is a genus of carcharodontosaurid dinosaurs that existed in what is now North America during the Barremian and early Cenomanian stages of the Early Cretaceous and Late Cretaceous, from 125 to 99.6 million years ago. Like most dinosaur genera, Acrocanthosaurus contains only a single species, A. atokensis. It had a continent-wide range, with fossil remains known from the U.S. states of Arizona, Oklahoma, Texas, Utah, and Wyoming in the west and Maryland in the east. Anatomy: three main weight-bearing toes on each foot; a huge animal about 11–12 meters long, short arms with three clawed fingers, powerful hind legs, skin of small scales. Full body in side view, whole animal visible, standing in an Early Cretaceous coastal river plain like the Antlers Formation of Oklahoma, with conifers, cycads 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