First, Draw a basic outline. Start with a circle and add a curve at the bottom for the chin. Place a line at each section as shown.
Draw the Eyes, Ears, Nose, and Mouth. The eyes should be placed so that the middle line intersects though the middle of them. About one eye legnth should be between them (green circle). The nose's bottom is at the middle of the bottom portion. the ears and mouth mabe be placed where you prefer.
Place the hair line anywhere, with any style you prefer.