"A highly detailed 3D model of a Tyrannosaurus rex, fully textured with realistic feathern, sharp teeth, and powerful muscles. The model should have accurate proportions based on paleontological studies, with a dynamic pose—either roaring or mid-stride. The eyes should be fierce and lifelike, with detailed reflections. The model should be optimized for use in animation and game development, with clean topology and UV mapping. Render in 4K with realistic lighting."