Before I started the pastel application, I erased dark outlines on the nose, lips, smiling lines for a more realistic shading. Now I can start with the pastel application. If you do the whole picture in a pencil sketch, this is where you would sketch in small circles or lines to shade the areas. It would take hours upon hours to cover all that area with a pencil. I chose to shade with pastels. In a few strokes I've got area coverage. Applied light to medium gray to his face, hair and neck. I added dark gray to his hair, eyebrows, jacket, and scarf. Looks like a mess, but that's how a some beginning projects will appear. Keep patience with you and keep applying those layers of whites, grays & blacks. You'll have a great outcome.