I can create heads and have a good likeness of whoever I'm using as a reference in the end, but when it comes to actually studying anatomy (muscles, bone, etc) I still get grossed out lol. @@Psyk0Sith knows his head anatomy, he will show you how to fix any anatomy issues and then it's just down to making it look like StarKiller. I strongly suggest that you pickup a sculpting program at some point, instead of doing the old school highpoly route.