Draw a simple circle for the cranium
Add a vertical centerline
Add a horizontal eye-line across the middle
Extend the jaw shape below the circle
Mark the chin at the bottom center
Connect the jaw to the sides of the circle
Place the hairline above the eye-line
Place the nose halfway between the eye-line and chin
Place the mouth about one-third of the way below the nose
Place the ears between the eye-line and nose line
Add the neck below the jaw
Check the proportions from front, side, and three-quarter views
Refine the outline into the final head shape
Add facial features and details
Clean up construction lines