At the start of the drawing just draw the shared edges that you can see of the subject. Different shades, tones, lights, and shadows can be added at the end. Focus on and draw shapes and spaces to avoid falling into drawing symbols rather than what is actually in front of you. Break the eye down into parts and just draw the shape as you see it of the white of the eye and then do the same for the shape of the eyeball. Drawing hair is largely a light-shadow process and given enough clues the viewer can work out and in fact enjoys working out the texture and nature of the subjects hair.
