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Pen Work - hatching - curved hatching -  (Illustration - Book Cover) Biro Drawing, Pencil Art Drawings, Shadow Drawing, Texture Drawing, Drawing Faces, Texture Art, Ink Pen Art, Ballpoint Pen Drawing, Pen Sketch
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How to Draw Shading With Hatching and Crosshatching

Basic information about hatching and crosshatching, along with a series of examples in pen.