简约卡通风海洋孤岛与鱼群自然生态宁静场景插画

minimalist style, main colors blue and green, overall color scheme blue, green, and white, island in the upper center covered with vegetation and rocks, ocean in the lower half, clear and transparent, schools of fish swimming in the ocean, distributed in the lower part, no decorative elements, no text, simple background design, upper part blue sky and island, lower part underwater world, fresh and natural visual effect, conveying a sense of tranquility, freedom, and vitality