Pastel Rainbow Clay Crab

Create a clean studio-style digital illustration of a whimsical rainbow crab on a plain white background, centered slightly left with lots of negative space. The crab is a cute semi-realistic 3D clay/soft-toy creature with smooth rounded forms, matte velvety surface, gentle ambient shadows, and pastel iridescent gradients blending cyan, teal, lime yellow, coral pink, lavender, violet, and orange across every body part. Show exactly 1 crab with a rounded oval carapace, 2 raised eyestalks with tiny dark glossy eyes, 2 large pincers, and 8 segmented walking legs. The left pincer is lifted high above the body in an open pose, larger and more vertical; the right pincer curves forward on the viewer’s right. The 8 legs are rounded bead-like segments with soft tapered pink-purple tips, arranged naturally beneath and around the shell. Add small mouth details under the front edge: 6 short soft appendages/tendrils in pastel pink, peach, and purple. Use a three-quarter front view, slightly from above, with the crab facing toward the lower left. Keep the style charming, polished, and tactile, like pastel polymer clay rendered with soft diffuse lighting. Add a small handwritten signature and date in the bottom-right corner reading signature_text. No ocean, no sand, no props, no border, no extra animals, no text besides the signature.