Create a serene watercolor painting of a mountain landscape with a gently winding river, set against a pure white background with a subtle texture to suggest a soft, cotton-like quality. The composition will follow the rule of thirds, with the river flowing from the foreground into the middle distance, occupying one-third of the frame. The distant mountains will be painted in soft, blue-gray washes (#87CEEB, #455A64), fading gently toward the peaks to create a misty, atmospheric effect. The lighting will be soft and warm, with the sun positioned at a 45-degree angle to the left, casting a gentle glow on the scene. The time of day will be early morning, with the sun's rays peeking through the mountains, casting a warm, golden light on the river. The river will be painted in soft, transparent blues (#56B3FA) and greens (#8BC34A), with subtle reflections to suggest calm water. Along the riverbanks, faint hints of greenery (#3E8E41) and rocky textures will add depth without crowding the scene. The watercolor style will be light and airy, with loose, flowing brushstrokes that capture the peaceful essence of nature. The brushstrokes will be bold and expressive, with a mix of wet-on-wet and wet-on-dry techniques to achieve a soft, blended effect. The color palette will be calming and soothing, with a focus on soft blues, greens, and grays. The exact colors and their proportions will be: Soft blue (#87CEEB): 30% Gray (#455A64): 20% Green (#8BC34A): 20% White (#FFFFFF): 30%