Ok, lets see...
First off for clothing, it's generally the best if you can have the people you're photographing to be wearing relatively muted tones, solid colors, and no patterns. Also, it's also usually helpful to have the whole shoulder covered, it helps people look more trim (not necessarily a problem for her... but, in general)
1. well, the bright sky is rather distracting on the background, and there is a fair amount of CA around her hair which I also find distracting. Also, I don't know what it is about her eyes in this photo but they just don't look right, maybe they aren't entirely sharp or something I dunno...
2. not too bad... here the thing I would try to avoid is the harsh shadows, and dark light dark pattern on her skin. Also, this is difficult because her face is dark in the photo and thus attention is not as focused on the face as it should be.
3. probably my favorite... again the eyes look a bit off, maybe a tad soft. and this is again where some shade would be helpful (oh man... I love cloudy days though... you can take photos practically anywhere)
4. pretty good shot... only things I would suggest changing. on the bottom left corner there is a little piece of skin showing, which is somewhat distracting. Also, her right eye looks a little funky in this photo, here if you had been able to have her looking a little farther away from the photo so you didn't have that eye in the shot (hidden by the nose) or more directly towards you it probably would have helped.
5. oy, those are some scary eyes. well, to be honest, I'm not a huge fan of that pose, but it works I guess... at least it's obvious she shaves.
overall not bad at all... I'm just giving this feedback for help on future sessions... just my 0.02 your mileage may vary