Wrinkles on the face are very much like folds in a piece of fabric. Like drapery, they are rendered tonally, not simply with lines. Here the light is from above. The tone gradually darkens as the surface curves under. In the trough of the fold (A), a heavy shadow accent occurs, with a sharp lower edge. The brightest tones (B) often occur right up against darkest tones. Shallow folds lack the sharp lower edge and darker tones. Often a deeper wrinkle trails off into a shallow one
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