Create a hyper-realistic, hand-drawn illustration capturing a peaceful mountain river landscape. The image should feature a crystal-clear, meandering river winding through a lush, green valley nestled among towering, rugged mountains. Set under soft natural daylight with a warm, early morning glow, the scene should include subtle mist and fog rising gently from the river’s surface, adding depth and serenity to the environment. Render this scene with precise, intricate textures in an ultra-HD style, using a color palette rich in earthy tones like umber, sienna, and olive green to highlight the natural beauty. The mountains should appear majestic, with snow-capped peaks and tree-lined slopes reaching toward a soft, pastel sky. In the foreground, place a scattering of rocks and boulders along the riverbank, accompanied by wispy trees and shrubs, adding hints of color and natural texture. Ensure the water has gentle ripples, reflecting the surrounding colors with lifelike clarity. Maintain an inviting, tranquil ambiance throughout the scene, with selective focus on the river’s flow and foreground elements, achieved with a 50mm lens simulation and a shallow depth of field to enhance the illustration’s realism. Apply a soft vignette and subtle sharpening to emphasize details while keeping the overall mood serene and immersive.