Dynomite portrait! Dude that is GB. (Oops!! just saw your comment title so I guess it isn’t GB. Looks like him though.)
www.imdb.com can provide some quick images of any film & television stars.
You did very well for a second portrait in ZBrush. I have struggled with using zspheres in human heads and want to try many differant way before I settle down into what is best for me. I would love to know how many ZS you used in this piece. Perhaps you could post an image??
Critique; just a couple things come to mind. And none are deal breakers. This is a truly fun piece! Since you may be wanting to lean toward caricature and a less usual pose these things may not matter at all. The cigar distracts me a little as the tip is so symetrical and in general expands in diameter so much toward the tip.
I was thinking of GB until I saw old black man in yout comment title. I was used to seeing that entertainer looking me straight on but head tilted down just a little more and looking up at us through the top of his glasses. This I think was common as he was not a tall man standing next to other actors.
Who ever it is, he looks like a fun guy.