By placing lines at various distances from one another, the image gets more structure and gives the illusion of a body. A variation in width gives more dimension to the image and illustrates a sense of realism.
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Apache by Dmitry Arhar on (gaaawd. Did this "artist" really not do ANY research about his subject? This is a white girl with face paint and a headdress no Apache woman would ever wear. It's not art, it's stereotypical, racist shite.