You can do a great drawing just by emphasizing value and light. Here you see a five minute drawing of my wife, Norene, with charcoal. I drew very basic shapes — head, lips, nose, eyes and hairline. Next I squinted to see the shapes of the shadows. I blocked them in — the right side of the face, under the chin, under the bottom lip, the top lip, above the eyelids, then the hair. On the left side of the picture you’ll see dark shading right next to the hair. I always put that against the side that is lit.