The hair clearly lacks volume and texture compared to the rest. Pretty good work though
I wager we won't get 3 more posts without somebody whining about putting a nudity warning in the title!! OMG nudity on the internet!!!1!
I think this could use some improvement but over-all I don't dislike it! I think my biggest gripe would be that is feels unfinished but since you said "older" I'm guessing it's done :)
There's a lot of issues with the lineart (or rather, lack of lineart?) in this piece. Looking through your other works, it seems to be a recurring issue. I'm assuming you're trying to do some anti-aliasing, but it's so poorly done that it just looks like there are stray pixels all over the place (hair, thigh, ass, etc). I've never been a fan of AA to begin with, so I can't really recommend any techniques to fix the problem, hopefully someone else can though.
Good style, bad hair.