the chest and the arms look like they belong to a body builder because they're loaded with muscles - not very female
but if it were to be a man in armor I'd say top notch! 
Remember that the suit is a thick body armour, ment to protect the user. It would be normal for it to be alot thicker then the regular body of the user.
Also, females are often seen as less threatening, since they are usually smaller, and less wide then men. Wouldn't this make enemies seem as if she is an easy pray to enemies?
The threatening posture of the armour could help scare of enemies.
As for the actual piece, I think het gun misses volume. I suggest looking up some references of a metal tube to get a good look at how to put volume in them.
Also, a few parts seem pillow shaded. In particular, the brown parts right (our view) of her chest.
Also, the lines look a bit jagged at some places, get rid of the selout.
Furthermore it's a pretty competent piece.
