Rainbow Yawning Cat 3D Art

Create a clean high-key 3D digital illustration of animal on a pure white background, shown in a dramatic stretching-and-yawning pose like a cat waking up. The single cat is viewed from a low front-left angle with its front legs extended toward the viewer, back arched upward, hindquarters raised, and tail curling into a large hook above the body. Use a smooth clay-like, glossy-soft 3D surface with no fur texture, covered in a vivid pastel rainbow gradient of cyan, turquoise, pink, magenta, yellow, orange, lime, and violet blending across the body. The mouth is extremely wide open with a visible pink-purple interior, tongue, gums, small yellowish teeth, and prominent canine fangs; the nose is pink and lifted upward. Include exactly 1 cat, 4 visible paws, 1 curled tail, 2 pointed ears with the right ear more visible, and a full set of small claws on the paws. Keep the composition centered with generous white negative space, soft studio lighting, subtle ambient shadows under the paws, rounded toy-like anatomy, and an adorable yet slightly monstrous exaggerated expression. Add a tiny handwritten signature and date in the lower-right corner reading date_text and signature_text. No other objects, no environment, no border, no watermark besides the small signature.