It looks decent so far man, I would say that you could go in and cut your poly count in half at this point, You have waaay to many loops in the eyes and lips, and the ears need some serious surgery. I would play around with taking out loops here and there and seeing if it makes it look better perhaps?
because when you take it into zBrush, you'll want to have the lowest mesh possible, otherwise you might as well do all that stuff in 3d....
-Z