Art style: Flat Design.
A rectangular yellow sea sponge with a porous surface, large round blue eyes, and a wide smile revealing two prominent white teeth. He has a small, pointed nose and three thin black eyelashes. He wears a white collared shirt, a red necktie, and brown rectangular trousers with a black belt. His thin yellow limbs end in white socks with red and blue stripes and black shoes. He stands in a bright, tropical underwater environment with stylized flower-shaped clouds. The lighting is sunny and even, highlighting his vibrant yellow color. He has a joyful and optimistic expression.
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FINAL STYLE ENFORCEMENT (this is the authoritative rendering directive — it overrides any style wording elsewhere in the prompt):
Render this image entirely in "Flat Design" style. Match the lighting grammar, material response, colour science, level of realism / stylisation, line weight, and shading model typical of "Flat Design". Keep the subject, composition, camera angle, lighting direction, and colour palette from the description above — but EVERY surface, skin, fabric, material, and environmental element must be rendered in the "Flat Design" idiom, not in any other medium.
