Create a premium mobile game app icon for a children's sticker decorating game. Show an adorable baby unicorn head with oversized glossy eyes, soft pastel colors, rounded cheeks, and a joyful smile. A giant magical glitter sticker is being peeled onto the unicorn from the top-right corner, with the sticker curling naturally to clearly show the satisfying peeling action. The sticker should sparkle with iridescent rainbow reflections and partially reveal a beautifully decorated unicorn underneath. Use a very close-up composition where the unicorn fills about 90–95% of the canvas, with the oversized sticker extending beyond the frame to create depth. Render in a polished Pixar-inspired 3D style with soft plastic toy materials, glossy highlights, thick smooth black outlines, vibrant candy colors, clean gradients, subtle ambient shadows, and a pure white background. The icon must instantly communicate "peel and decorate," remain readable at small sizes, and look like a top-grossing kids' mobile game icon with no text, no borders, and no extra background objects.