C&C per req: (by #4, I'm assuming you mean the girl reposed on the JD road grader). As mentioned, a lot of issues which would put it out of the portfolio category in my mind: THe exposure is shot; her dress is completely blown with almost no detail anywhere, as are the tops of the rear wheels and blade leveling wheels, not to mention the sky, her face and upper arm. The use of a couple of diffused strobes would have REALLY helped with this, or shooting for HDR.
The next major issue for me is the background. The house really detracts from the overall composition. If moving the grader wasn't an option, consider compositing a different background.
I can't say for sure, but it appears that her face is slightly softly focused, but that may just be due to the highlights.
The pose is a matter of taste, but IMO, it doesn't really work with the grader as a prop; having her sitting on the deck, one leg on the hitch would have worked well, or standing on the deck leaning against a levelling wheel.
The idea is good ('though I wish she was smiling, or at least not looking annoyed), but the technical aspects could use a LOT of work.
Just my $00.02 worth - your mileage may vary.
~John