For #1, I see this pose a lot in glamour or wanna-be model portfolios, and I don't really get it. I guess it's supposed to be sexy or whatever. But all it ever looks like to me is that the girl is being mugged or raped. I don't know, it's just the whole 'up against the wall' thing. That pose does nothing for me, and pretty much has only ever looked bad to me. Aside from that, which I blame on the model, the lens flare across her shoulder, coming from the rim light or whatever that is, bothers me. And it also seems to be blowing out the back of her shirt.
For #2, Having that power line cutting her head off looks terrible to me, and cropping right below the knees is also somewhat awkward looking; and having her knees locked out gives her those clumpy looking knees. It would be better for her to have a very slight bend in the knees, which would make the knees look more normal, and also would engage all the muscles around the knee to give a better looking muscle tone. I would clone out the power line. Other than that, it's a nice shot.
For #3, THe background is total chaos, but I like the shot besides that. I think layer ing dropping down the background could help alot. Or using a strobe in the field to underexpose the background.
For #4, Kind of has a deer in the headlights look to it. Not feeling much energy from the model in any of these. Like she thinks modeling is just about standing there and being reasonably attractive. Also, these all seem to have a bit of a problem with blown out whites.
Also, I agree with everyone that her eyebrows are totally whack...