Value shapes

Values are the many different tones between white and black.  They are only created 2 ways. 1) Hatching lines become darker or lighter depending on how closely they are drawin together. 2)  Putting down actual grey tones with pencil, charcoal, ink etc. Overall value is the only way to model form  with light. 

Hatching lines not only show the light and dark areas but also the structure of the face as if it were carved from wood.
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