Draw a circle for the head
Add a vertical center line
Add a horizontal eye line
Sketch the jawline and chin
Mark the hairline
Draw the eyes on the eye line
Add the eyebrows above the eyes
Draw the nose in the center
Add the mouth below the nose
Sketch the ears on the sides
Draw the neck
Add the shoulders
Outline the hairstyle
Refine the face shape
Add eyelashes if desired
Draw the pupils and irises
Add details to the lips
Clean up the guidelines
Darken the final lines
Add shading if desired