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A vibrant, ultra-cute 3D cartoon-style underwater scene featuring a smiling dolphin jumping gracefully out of the ocean water. The dolphin has a smooth glossy skin texture with soft blue gradient tones, large shiny expressive eyes, and a happy open mouth. Surrounding the dolphin are multiple small colorful tropical fish (yellow, orange, blue) swimming playfully in different directions. The ocean water is crystal clear with dynamic splash effects where the dolphin emerges, including detailed water droplets and bubbles floating in the air.

The underwater environment is filled with vivid coral reefs in bright colors such as pink, orange, red, green, and purple. Include various coral shapes like branching coral, soft coral, and round coral clusters. Add starfish on the seabed and colorful sea plants swaying gently. The ocean floor is visible with smooth sand and soft lighting.

Lighting is soft, dreamy, and magical with a slight glow, high saturation, and pastel tones. The background transitions from light turquoise near the surface to deeper blue underwater. Add floating air bubbles throughout the scene with reflective highlights. Style should be Pixar-like, highly polished, ultra-detailed, 3D render, high resolution, soft shadows, depth of field, cinematic composition.

Composition centered on the dolphin mid-jump, slightly above water surface, with splashes and bubbles creating motion. Bright, cheerful, playful, and kid-friendly atmosphere.