Learning zbrush

So the past few days I've been trying to learn zbrush As I feel that if i'm going to get anywhere this year. I'm going to need to learn the basics of it along with UDK.

So after hours of watching tuts on how to get around the interface of zbrush. I managed to import my face from my mortal engines project and i had a little go at sculpting over it which didn't turn out too well.

Kinda didn't feel it looked like me much. So i decide today to work from just z spheres and build my head up from there which i find look far more convincing. Only problem is is that i don't know how to model the eyes in. I need to work on how to do eyes as i haven't clue at the moment.