In the above picture, you can see shading of the human face / head. Shade the head with the idea of giving your drawing an illusion
of solidity. At first use as few tones as possible. Start with three simple planes: light, medium and dark. The planes facing the
light are white, the side planes are a medium tone, and all underneath planes are dark. After this is well understood you may
proceed with as many tones as you wish, trying at no time to lose the three tones you start with. Remember, all the shading
in the world will not improve a bad drawing.
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