Would anyone be kind enough to give some honest critique?
The lighting and the processing is kinda horrible.
The lighting does nothing for him. It doesn't carve out his facial features.
The processing is kind of all grey in the black and white one, there are no deeper areas of blacks caused by the lighting etc. In the colour one his skin tones are ruddy and unretouched.
I'm unsure if you were asked to shoot an 'actors headshot' but this is not one. Actors head shots are shot in particular ways according to casting directors requirements.
Lastly he looks utterly bored. To take a picture of an actor looking utterly bored is really quite an achievement (or they are a terrible actor). Or maybe they were a fantastic actor and trying to look bored. I don't know. I would have gone for facial expressions other than 'bored' personally.
The bottom line is that no actor is going to want shots of themselves looking bored, with all their (teenage?) skin flaws on display and making their nose look kinda lumpy because it's in profile.
Back to the drawing board entirely I fear, starting with the lighting.
ETA: I just want to demonstrate with one of my shots what I mean. It's here:
http://charlottemoss.businesscatalyst.com/images/_mg_6933web.jpg
So here I've also got a young man in profile, just like your shot. But I've turned him further away so that I don't get his cheek bisecting his nose which makes his face look fat.
I've also used just a single light source to give him depth under his cheekbones and so forth, which in fact he does not particularly have in person.
The wider crop allows us to see more of his head, because people have backs of heads too.
Shallow depth of field adds fashionable style and the harder light with more contrast allows for a much easier black and white conversion.
It's still not an 'actors headshot' but I think it's more interesting, and to be frank would only take turning some lights off from your setup and posing him differently.
Further to that, turning him 90 degrees towards me produced this:
http://charlottemoss.businesscatalyst.com/images/_mg_6913web.jpg which would be much more useful to an actor (although still not really an actors headshot).