Burne Hogarth once wrote, "Among all the subjects which the art student is called upon to draw,

 none is more complex than the human head."

Drawing the head is not only a challenge to students but also to professionals, and not only capturing the correct proportions,

 but also the subtleties of form and shadow.

 Light and shadow give depth, understanding and capturing these correctly are necessary to anyone who is serious in progressing

to a more challenging medium.