Realism Study-feedback wanted

Arcade

so with school started again, the class picked up zbrush and started sculpting Dwayne "The Rock" Johnson. I found it rather hard to be motivated to sculpt with many lingering eyes and expectations, guess i just have to learn to deal with preassure since im used to producing art in a dark dark cave!

so to prove i could do much better than what i produced for class i revisited the subject in my free time. though im still working at it and pushing forms, my friend insists i post it now to get feedback.

yes im procrastinating about the teeth lol

*edit*
sorry heres the ref

AgelosAp

Posting your reference too would be useful, although I know from the Hercules trailer that this is probably the face he made when breaking the chains :P
Up to now I 'd say the crevices and tension especially around the mouth/cheeks are less defined/deep than they should.

Arcade

here is an update of where im at. i feel its getting there, teeth are a fricking pain to do -.-
any way what peeps think?