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A highly detailed, ultra-realistic fantasy illustration of two golden koi fish intertwined in a dynamic circular motion, symbolizing yin-yang balance. The koi fish are fully covered in metallic gold scales with intricate reflective textures, each scale sharply defined and layered. Their fins and tails are stylized with ornate Thai-inspired flame patterns, glowing with a rich golden hue.

The upper koi is leaping upward with water splashing dramatically around it, droplets frozen mid-air with high clarity and realism. The lower koi curves downward, creating a perfect circular flow, with its body partially submerged in splashing water. Beneath them is a scattered pile of glowing gold coins, highly reflective and detailed, adding a sense of wealth and prosperity.

Water effects are vivid and energetic, with bright blue highlights contrasting strongly against the dark background. The background is deep black with subtle smoky swirls rising around the fish, enhancing the mystical and luxurious atmosphere.

Lighting is cinematic and high contrast, with strong highlights on the gold surfaces and soft shadows to create depth. The composition is centered, symmetrical, and extremely sharp, with 8K resolution, ultra-detailed textures, high dynamic range, and professional digital painting quality.

Style: hyper-realistic, fantasy, luxury, ultra-detailed, sharp focus, studio lighting, black background, dramatic splash, gold texture emphasis.