I'm curious as to how this is a self portrait? Besides that, the pencil work is gorgeous. Managing to cross hatch and make it look half like shading and the controlled way you erased(?) parts of the skull to create patterns was very effective.
How is it not a self portrait? If this is what he/she sees, or chooses to see, from whatever perspective he or she chooses to see from, when looking at his or herself, then it is a self portrait.