A serene underwater scene with two koi fish in contrasting colors, one a radiant white with a single dark circle on its forehead, and the other a deep black with a bright white circle on its forehead, forming a perfect yin-yang symbol. The fish gracefully swirl around each other, creating a sense of harmony and balance. The water around them is a rich, deep blue, with soft ripples and delicate light reflections, enhancing the mystical atmosphere. A few green lily pads float at the surface, adding natural accents to the scene. Painted in a semi-abstract style, with soft brushstrokes, blended colors, and gentle highlights around the fish, evoking peace and unity