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A highly detailed, ultra-realistic digital artwork of a golden koi fish gracefully swimming in a dark, elegant underwater environment. The koi fish has shimmering metallic gold scales with intricate reflections, each scale clearly defined and layered, creating a luxurious glowing effect. The fins are semi-transparent white with soft gradients, flowing smoothly and naturally, appearing delicate and silky.

The fish is positioned diagonally in the frame, slightly curved in an S-shape, giving a sense of fluid motion and elegance. Surrounding the koi are swirling streams of golden liquid light and soft glowing particles, resembling magical flowing energy or smoke, with smooth, fluid motion trails. These golden swirls wrap around the fish, enhancing depth and movement.

The background is a deep navy blue to black gradient, creating strong contrast with the bright golden tones. Small floating golden particles and light bokeh dots are scattered throughout the scene, adding a dreamy and ethereal atmosphere.

Lighting is soft yet dramatic, with a main light source highlighting the top and side of the fish, creating strong reflections on the scales and subtle shadows underneath. The overall composition is cinematic, high contrast, and visually luxurious.

Style: hyper-realistic, 3D render, cinematic lighting, ultra-detailed, high resolution, 8K, soft glow effects, depth of field, fantasy aquatic theme, elegant and premium aesthetic.