Rainbow Yawning Cat Stretch

Create a clean studio-style 3D illustration of a {argument name="animal" default="cat"} stretching in a dramatic play-bow pose on a pure white background, with the front legs extended forward, rear body raised, back arched, tail curled high in a hook shape, and head tilted upward while yawning with a huge open mouth. Show one animal only. Make the body smooth, rounded, plush, and slightly clay-like, with stylized anatomical detail: visible triangular ears, rounded paws with small claws, a pink nose, a curled tongue, gums, and two rows of small teeth including prominent upper and lower fangs. Cover the entire animal in a soft iridescent rainbow gradient fur/skin pattern, blending {argument name="color palette" default="cyan, turquoise, hot pink, magenta, yellow, orange, violet, and mint green"} in glossy pastel bands across the face, limbs, torso, and tail. Use soft ambient lighting, subtle shadows under the paws, high-key exposure, smooth subsurface-looking material, and a polished cute-surreal toy aesthetic. Composition: vertical portrait canvas, the animal fills most of the frame, angled diagonally from lower left foreground to upper right background, mouth near the left-center, raised tail near the upper right, with generous white negative space. Add a small elegant artist signature and date in the bottom-right corner reading {argument name="date text" default="July 29, 2026"} above {argument name="signature text" default="Oyagi"}. No other objects, no scenery, no border, no extra text.