several hatchings such as cross lines and dots are used to represent the depth within this portrait. as seen in this image the darkness of an area is shown by doing a much more of a closer/tight hatchings.
Diagrams for drawing legs and human anatomy. Good to know. Please also visit www.JustForYouPropheticArt.com for colorful-inspirational-Prophetic-Art and stories. Thank you so much! Blessings! #AwesomeDrawings