Very nice. The likeness is pretty close to Vin Diesel, I think. For a basic rendering it’s really good, but I am curious as to why he lacks any pupils and if it’s possible to make his face less flat on the back of his head and ear. It could use a bit more "meat" there...like in his lips and around his jaw. But I'll admit I don’t know the basics to z-brush, so I'm only commenting on the piece on a purely visual stand point, not a technical (as in construction) one. Still, it’s cool to see the variety of works and mediums you do. Because it seems you're very versatile in both 3d and 2d. ^_^

He simply has no eyes as I am still learning Zbrush and am working with only one mesh. Had this been an absolute finalized piece, I would have probably brought it back into Maya to add some eyeballs and stubble. Your comments are noted, and while I hope not to deter any further comments, I will probably not be making any changes to this model anytime soon. Vin was simply a testbed to acquire knowledge and experiences to put into future pieces. I think I'll try to model Steve Buscemi next.
Thanks.

I think it's a very good likeness.

Sure thing! I figured it wasn't a finished piece, which is why I made an observation concerning the ear and head. But if no changes are to be made... aw well, no problem. The resemblance is there none-the-less.

I admit I still like that Steve Buscemi pumpkin...so I'm all in favor for your next model idea. ^_^

Looks just like him, but I think it needs a bit less acting ability (oh snap, burn on Vin Diesel) :D

--
"Explosions in anime is like sex in porn!"
-Lee Burwasser