Draw a simple oval for the skull
Add a vertical center line down the middle
Add a horizontal guideline across the middle for the eye line
Mark the brow line, nose line, and chin line
Sketch the jaw shape from the sides of the oval to the chin
Place the eyes evenly on the eye line
Draw the nose between the brow line and chin line
Draw the mouth between the nose line and chin line
Add the ears between the brow line and nose line
Refine the hairline around the top of the head
Add the neck beneath the jaw
Adjust the proportions and symmetry
Outline the final features
Erase the construction lines
Add shading and details