Answer:
Circulism: Used to shade a base layer on the hand to give it a consistent base texture.
Contour Shading: Used to shade stretched skin.
Hatching: Used to shade nails and stretched skin.
Cross Hatching: Used to create patterns in the skin and to emphasize deep valleys/crevices.
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Answer:
This is called micro tones. They can blend and either sound like cracking on purpose, or a riff.