I think it's a good portrait but there are some things you may want to consider:
- there is too much space on the right side and too little above her. blank spaces are allright but i don't see that much interest on the wall.
- the grainy effect doesn't really work, I'd like it more clean.
- try using rulers in PS (cmd+R) and you'll see the wall lines aren't completely straight. this is quite important if you have so many lines in the picture. I think you should rotate it a little bit clockwise and maybe apply the lens distortion filter.
- more contrast between the wall and the girl's skin could help.
- don't take this too seriously, I am quite new to the photography world