Begin with a side view of the zombie that you will about to draw. Draw the head shape, then draw the outline of the jaw which is shaped like a cone. You will then begin sketching out the forehead, protruding brow, then the nose, screaming mouth, and then the chin and jaw line. Remember you are drawing this walker from the side. The next thing you will do is sketch out the eye along with the tattered darkened skin around the eye which is the bags. Sketch in the prominent cheekbone, then sketch in the facial definition which is the skin. Draw the nasty teeth both top and bottom, then sketch in the slim or drool on the chin. End this step by sketching out the shape of the neck, all the detailing on the neck, and the few pieces of hair that are sprouting from the head. Don't forget to draw out the ear as well as add detailing.