The three-quarter view is more challenging than the profile and frontal views, but if you begin with the usual proportion guidelines, you shouldn’t have any trouble. Simply take your time, and observe closely.
Follow the steps as shown, using charcoal for the block-in stage. When you begin shading, use dark, bold strokes for the eyebrows, mustache, and beard. Notice this subject’s facial expression; his dark eyes are intense. Fill in the irises with the darkest values, but be sure to leave tiny white highlights.