卡通风格热带海滩风光蓝天白云大海沙滩棕榈叶插画

minimalist background, blue and white color scheme, light blue, dark blue, white, and a touch of green, ocean at the lower middle part of the image, gradient from light blue to dark blue, sandy beach at the bottom in light yellow, sky occupying the upper half in dark blue with white clouds, green palm leaves at the top left corner, no decorative patterns or borders, clean and natural gradient of sky and ocean, fresh and bright visual effect, conveying a sense of tranquility, relaxation, and joy, typical tropical beach scenery, suitable for tourism promotion or background material