For this drawing I covered my paper in a dark charcoal and then used my eraser to extract and lighten the forms. This technique seems to be a bit more like painting than drawing. I was fairly surprised how much variety in value you could get through erasing. You seem to be able to form shapes in a more fluid manner (hence why its more like painting). There are places where I erased too much and had to go back over and darken and try it again but over all this was done in one hour long sitting.
Neanderbill (because the head is a bit big looking, my fault not his, although I sort of like it):
19 x 24 charcoal
CU of the face