生成写实风格的夏日高山河谷自然风光，低角度构图，清澈的浅溪从远景山谷蜿蜒流向前景，溪底铺满圆润鹅卵石，水面在阳光下反射出粼粼波光；河谷两侧是覆盖鲜绿丰茂草甸的缓坡，草甸间点缀着白色、黄色、淡紫色的野生小花，草坡上散布深绿色矮灌木丛；左侧远景山坡生长着成片深绿色针叶林，右侧紧邻溪流处是表面粗糙、带有自然裂隙的灰褐色陡峭岩壁，岩壁缝隙与顶部附着少量苔藓和绿色植被；画面上方是淡蓝色天空，漂浮着大块蓬松的白色积云，晴朗白日的柔和日光从斜上方照射，在草坡和岩壁上形成明暗错落的阴影，空气通透，色彩自然真实，整体氛围清新宁静。

Generate a photorealistic summer alpine river valley natural landscape with a low-angle composition. A clear shallow stream winds from the distant valley towards the foreground, with round pebbles covering the stream bed and sparkling reflections dancing on the water surface under sunlight. Gentle slopes on both sides of the river valley are covered with lush fresh green meadows dotted with small wild flowers in white, yellow, and light purple, interspersed with dark green low shrubs. Dense dark green coniferous forests grow on the distant hillside to the left, while immediately adjacent to the stream on the right is a steep gray-brown rock face with rough textures and natural cracks, with small amounts of moss and green vegetation attached to the crevices and top of the rock wall. The upper part of the frame shows a pale blue sky dotted with large fluffy white cumulus clouds. Soft daylight on a sunny day shines from an oblique angle, casting alternating light and dark shadows on the meadows and rock walls, with transparent air, natural authentic colors, and an overall fresh and tranquil atmosphere.