Wow. Amazing. The detail is incredible. Pupils are too big but that's nothing to do with the sculpt. If you get this printed, you need to make sure all that detail is captured - likely to be expensive but it will be worth it
I think it looks incredible, but if I may give some advice. The scar on his left cheek should be lowered and more straight instead of on a slant and possibly made a little wider, besides that it looks great. here is a pic:
Excellent work. Should you ever print this, I'm definitely interested. Would you consider doing a 1/4 scaled replacement head hor the Hot Toys bust as well?