Smudging: Creating subtle gradations in shade and tone by using a finger or other tool to smudge the medium used to draw.
Cross Hatching: Drawing in two or more layers of hatching (straight, parallel lines) at various angles to create a mesh-like pattern.
Scumbling: Using a random, scribble-like circular motion to shade an object.
Stippling (Pointillism): Using a series of dots to create the effect of shading.
In light of the following video, remember one of the biggest rules of charcoal drawing: Don’t blow it!
For your next Sketchbook Assignment:
Cross Hatching Tutorial: