不错的手绘线稿图，大家可以借鉴、学习-----151359626
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Pin by Henrique Navas on sketch | Pinterest
Sophomore Year Sketchbook 产品设计铅笔草图 by Paul Ka...
【适合模仿的 Old School 风格线稿 第二辑】Concept Sketches L...
Igor Guinau | Fashion writer & consultant...
Pin by Alessandro Arangino on Industrial Desi...
Sketch of a Robot by designer Spencer Nugent
Julius Tarng - Industrial + Interaction Desig...
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Spencer Nugent Sketch !
Inspiration. | ID Sketching | Pinterest
Sketch-A-Day: Daily Sketches from Industrial ...
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Sketches of Coffee Makers By Designer Spencer...
手绘技能剖析教程之渐进式（1） - 视觉同盟(VisionUnion.com)
Carlliu手绘教程：MP3随身听（2） - 视觉同盟(VisionUnion.com)
老师给的 一些 工业设计练习图 看看 非常有用
