Nice lighting not a bad head angle. But generally headshots are supposed to give the prospective employer an idea of what the persons (best) features are and how they look on film.
The tight cropping into the hairline is part of a editorial fashion look, not an actors headshot. An actors head shot should include all of the head, hair facial features and upper torso. Take a look at any promo shot on any of the several actors websites.
If I were to hire your actor with this shot, How do I know he is not fat or bald? There are always exceptions for every rule, but when you deliberatly exclude body parts for an actor that gives rise to questions from the employer, producer, director etc. So then they go the next shot in the stack and so on. Leaving your client to wonder why he is not getting any calls for a go see, or a reading.
Remember the image you are creating is what he is going to use for advertising his style, looks and character. This image could be used as part of a zed or leave behind card. But not as a stand alone image on an 8x page.
Image standards change constantly (hey it keeps us busy) but I generaly go by what is published in New York, or L.A. as a guide. I also discourage newbies fron any outlandish images and try to keep it simple until they get more work. And of course actors are different than models, and agencys change their minds like the wind. I do like your image and I hope it is successful for your client.
Les Baldwin