First, I'll start by saying that I like the set. Good variety of angles, poses, and good use of light. I like your processing, and in general, these look way better than what I got when I was a senior in HS.
Looks like all available light, and if you were into adding your own light, I think a touch of fill flash on some wouldn't have hurt (7 and 9 were the ones that made me think that, for some reason 6 did not even though it's very similar to 7). But, that's the kind of thing that the client wouldn't notice at all, because they're already really good. Just something to think about when you want to push yourself as a photographer a bit.
As far as poses, I'm not super keen on 14 and 15. Love #12. The ones with the chair are really good as well.
All in all, nice set, thanks for sharing!