C&C per req;
1. As mentioned, the image needs fill light, 'though the background lighting is very nicely rendered. It also needs to be leveled. Try and avoid placing the horizon at/near the centre of the image, and don't clip bits of limbs, such as her left hand.
2. This would have been a great shot with a little bit of fill light. Watch the minor details. Her shirt is partly tucked into her trousers, and try to avoid rotating the subjects head so far as to obscure the sclera totally on one side.
3. Shooting from above is not usually a good choice for this this style of image, and this case is no exception. Looking down on her like this puts her in a subservient position. Also again, details; a quick brush of the hair would have helped a LOT.
4. The colour seems off here; a bit high on the green channel. I think with a bit more exposure this would have been a nice shot.
Just my $00.02 worth - your mileage may vary.
~John