Um,Cough what are you using?Gimp?
First thing,the design is ok,I also love the shading for the plates.But,I feel you should have shaded outside,that dark black,I think without them the head would look better,and less blury.It's a good head,even if it's not your first try,probably you need to work more on the shading for the eyes.And,maybe something for the back.
Good job.