As I mentioned in class, this turned out quite well! I like the modifications to the design of the basic skull-forms to suit the character. You broke down the elements consistently with only a minor points off in a couple angles. The shading helps to define the planes of the face, and I think you really got a handle on the assignment as a whole. Good consistency, good form!
If there was anything to work on, I would say just to continue to use comparison points on the face for accuracy. I look forward to seeing more of this guy!