To me, your port seems sort of bland. I'm not sure if your trying to get more into fashion or the art side of things, but either way I think you would benefit from playing around with big colorful looks and more interesting backgrounds.
Your first two nudes are the best you've got so far, as far as set and pose go. However, those tan lines make me cringe. Perhaps there is a way to salvage those pictures with some post editing.
This picture is my least favorite:
The model is making an unflattering expression, the clothing is ill fitting and there is nothing particularly creative about the photo (what I like to call nudey for the sake of nudey).
Lastly, this one:
I am also a model with bad posture. Please please please! If you see something, say something. I can't tell you how many photos were off by that much just because I was too focused on facial expressions to remember my shoulders. You'll be doing both of you favor!