素描风格插画

参考提示词：The image depicts a detailed sketch of a man's head, rendered in a monochromatic style. The man has long, flowing hair and a full beard, with intricate lines and shading that emphasize the texture of his facial features. His expression appears contemplative or serious. The background is plain, allowing the focus to remain on the detailed drawing of the man's face. The sketch is executed with fine lines and shading techniques, giving it a realistic and textured appearance.