Definately work on the basic aspects of light and shadow. Since you were just using a random person for a subject, you obviously don't have an actual photo or model to work from, so getting these aspects down is a lot harder. Also getting a real set of pencils will help as well.
When doing portraits, it's best to start with what a teacher of mine called a "vector head." This is a way of getting the eyes nose, mouth and all other aspects of the head in porportion, all based on placement compared to an idealistic "perfect" head.. From there, the individual's slight variations from this perfect head can be made, while keeping the aspects close to what we know are "normal." If I ever get a chance I'll dig up my old student work and do a mini-tutorial on drawing the human head.
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