Pastel Rainbow Crab

Create a clean studio-style 3D illustration of a whimsical rainbow crab on a pure white background. The subject is a single cute toy-like crab with a smooth rounded shell, soft clay/plush texture, gentle subsurface shading, and pastel iridescent gradients blending {argument name="main color palette" default="cyan, turquoise, pink, purple, yellow, orange, and lime green"}. Pose it in a three-quarter view facing slightly left, with the body centered and lots of empty white space around it. Include exactly 2 raised eyestalks with small dark glossy eyes, exactly 2 large pincers: the left pincer lifted high above the crab and open, the right pincer forward and lower, curved inward. Include exactly 8 segmented walking legs, 4 on each side, made of rounded capsule-like joints with tapered tips, all colored in different rainbow gradients. Add a small row of rounded mouth parts and short feelers under the front shell. Use soft realistic lighting, subtle ambient occlusion, very light contact shadow beneath the legs, high-resolution polished render quality, no scenery, no props, no border. In the lower right corner, add a small handwritten artist signature and date reading {argument name="signature text" default="July 30, 2026 Oyagi"}, in thin black ink, unobtrusive.