Industrial Design Marker Sketch: Brown Main Body Layering Expression
工业设计马克笔手绘：棕色主体层次表现
English Prompt:
Smart product, marker coloring, industrial design marker hand-drawing, fully colored, main body in brown with layers to highlight the subject, enhanced hand-drawn lines for the main body, no background, white background, no messy lines, no internal structure.
中文Prompt:
智能产品，马克笔上色，工业设计马克笔手绘，全部上色，主体棕色，有层次突出主体，加强主体手绘线条，无背景，白色背景，无杂乱线条，无内部结构
Resolution: 600×600