Create a square digital 3D illustration of a stylized deformed human girl bust portrait on a deep black background. The character is shown from the upper torso up, turned slightly three-quarters to the viewer’s left, with a large head, small chin, short neck, slim shoulders, and a mildly annoyed or unimpressed expression. She has heavy-lidded eyes looking sideways to the left, downturned brows, a tiny nose, and a small closed frown. Her hair is an abstract sculptural bob made of thick rounded ribbon-like masses: one large sweeping bang across the forehead, two puffy side locks, and rounded layered hair volumes behind the ears. Remove natural object-specific colors and render the entire character as smooth matte clay-like forms with luminous gradients instead of outlines: blend {argument name="main gradient colors" default="hot pink, violet, cyan, soft blue, peach, and mint green"} across the skin, hair, and clothing so all parts share the same iridescent color language. Dress her in a simple short-sleeve hooded top with a soft rounded hood opening and rolled sleeve cuffs, also made from the same smooth inflated abstract shapes. Use soft studio lighting, subtle ambient occlusion in the creases, velvety subsurface shading, high-quality 3D render detail, and a dreamy toy-sculpture aesthetic. Composition should place the face in the upper center, torso cropped near the lower edge, with generous black negative space and no scenery. Add a small elegant handwritten signature and date in the bottom-right corner reading {argument name="date text" default="July 25, 2026"} and {argument name="signature text" default="Oyagi"}.