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A vibrant, high-quality 3D cartoon-style underwater scene featuring a large, friendly blue shark swimming toward the viewer with its mouth wide open, showing sharp white triangular teeth and a playful expression. The shark has a smooth, glossy body with light reflections, a white underbelly, and expressive big eyes that make it look cute rather than scary.

Surrounding the shark are multiple small, colorful tropical fish in shades of orange, yellow, and white, swimming in different directions, creating a lively and dynamic composition. The underwater environment is bright and cheerful, with sunlight rays penetrating from the water surface above, forming soft light beams and gentle caustics.

The seabed is detailed with soft sand, small rocks, and a variety of vibrant coral reefs in pink, purple, blue, and orange tones. There are sea plants and seaweed gently swaying, adding motion and depth to the scene. The background fades into a light turquoise gradient, giving a sense of depth and clarity.

The overall style is clean, polished, and highly saturated with soft shadows, smooth shading, and a Pixar-like 3D illustration aesthetic. The composition is centered on the shark, with a slightly wide-angle perspective to enhance immersion. High resolution, ultra-detailed, sharp focus, cinematic lighting, playful and kid-friendly mood.
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