**character design sheet of "tun tun", an adorable yangtze river finless porpoise sprite, plump and smooth gray-blue body, glossy glaze-like texture, famous crescent-shaped smile, a small fountain sprouting from its head, dorsal fin shaped like the silhouette of the three gorges mountains, large empathetic eyes, healing and cheerful expression, 3d cartoon style, pixar style, soft lighting, uhd, rendered in octane