Surreal Cosmic Landscape with Rainbow River

Create a surreal cosmic landscape in a highly detailed digital art style. In the foreground, depict a rocky valley with sparse green vegetation and trees. A winding river flows through the valley, reflecting vibrant rainbow colors like an aurora or oil slick, shimmering with hues of red, orange, yellow, green, blue, and purple. The river reflects the light from above. In the midground, show rugged rocky hills and mountains. At the center, a tall jagged mountain peak rises, with fluffy golden clouds surrounding its base and top, illuminated dramatically. Behind the mountain peak, a bright sun or star is rising or setting, emitting powerful rays of light bursting through the clouds in a starburst pattern. The night sky is dominated by a stunning Milky Way galaxy, with dense clusters of stars in whites, blues, oranges, and golds, stretching diagonally across the sky. Include nebulae-like gas clouds and distant stars for depth. The overall atmosphere is magical and otherworldly, with high contrast between the dark sky and glowing elements.