https://www.cutoutandkeep.net/projects/depicting-shadows • Posted by GMC Group
In drawing, we depict the grays of shadows with hatching—lines drawn more or less closely together that produce surfaces. They can range from very delicate grays to almost black. Hatching also enables us to convey textures and surface properties.
The second way of portraying grays is with a solid area of tone—using ink, for instance.
A combination of the two techniques is also possible, for example when you color a drawing or intensify it with a glaze.
The most important thing to realize is that what you see is light, but what you draw is shadow. Do not use it too sparingly.