C&C per req:
First off, #2 is the only head shot of the group; #1 is a full-body portrait and #3 is a shot of some stadium seating with what might be a person middle back.
Without knowing what specific purpose the 'shots are for (I'll assume modeling/theatre) the first thing that strikes me is exposure. You need at least 1/3 stop more image left. Shadows are good, but this is really too darki, and there's lost detail in his hair and on his shirt. The other issue is: Why did you pose him so close to the background. Brick walls are not great backgrounds (unless they really mesh with the style of the image, in this case I don't see that), and here all of the lines and patterns really distract from the subject.
The first image would be a great one for a male modeling portfolio IF it had a better background and a bit more exposure.
They're not bad, but there's definitely room for improvement. If these are for submission to an agency, I would suggest a little more research and a reshoot.
Just my $00.02 worth; your mileage may vary.
~John