Incomplete question
need more information
too broad
need more context
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.
Picasso and Braque created cubism
