Prompt: Theme: An old man on a lonely boat;Main Element: The old man, dressed in a raincoat and hat, sits alone on the boat. His expression is calm, his eyes deep, as if immersed in his own world. Background: The vast river is empty except for this lonely boat. The sky meets the water, creating a wide horizon. In the distance, the outline of mountains can be seen faintly. Details: The old man's hand rests lightly on the oar. The texture of the raincoat and hat is visible. Occasionally, fish leap out of the water, breaking the calm. Color Scheme: Warm colors such as brown, gray, and beige create a warm and simple atmosphere. Light and Shadow: The sun shines obliquely on the river, creating a contrasting light and shadow effect. The old man's shadow is cast on the boat, contrasting with the surrounding environment. Ambiance: Quiet, peaceful, and contentedly carefree, it exudes an ease and freedom from the hustle and bustle of the world. Emotion: Expresses the old man's emotion of enjoying solitude on the boat and living in harmony with nature.