Summer Deep Green River Water Surface Close-Up AI Image Prompt

9:16 vertical realistic photographic image, pure close-up of a summer deep-green river water surface, the water surface fills the entire frame, with no riverbank, vegetation, sky, or floating objects. The river water is deep and rich in color, showing a gradient from dark green to deep green; the water is clear and transparent but the color is deep, and beneath the water surface faintly visible are dark water-flow textures and weak shadows in alternating light and dark. The water surface is covered with fine, even ripples; light green textures emerge on the deep green water surface, ripples spread layer by layer, with a natural and smooth direction and well-proportioned density, forming a delicate and orderly water-surface texture. Sunlight slants into the water from above the frame, forming slender bands of light and shadow; the water surface has tiny flickering silvery-white and pale golden sparkling highlights, varying in size and evenly distributed, forming a sharp contrast with the surrounding deep green yet shining in a restrained way. Underwater dark water-flow patterns appear as flowing lines, faintly visible in the deep green water body, adding layers and depth. Light slants into the water from the upper left of the frame; when the light beam passes through the deep green water body, it shows a gradient from bright green to dark green. Overall deep green tone, with only the surface highlights as natural bright accents, quiet and profound, cold and cool, high detail, film texture, clean and pure image.