Linda - C&C Please!

[Dramatis]

Busy busy busy! After nearly three weeks of no photography (it's been a sad month) I finally got a chance to do a photo shoot with a friend. Linda (pictured below) is being recruited by a modeling agency and wanted a few homebrew photos for her portfolio. I know they aren't up to the usual professional standard but she likes them and so do I. What I'd like to know is: given what you see here how can I improve the next time I go out for this kind of shot?

1.
http://i159.photobucket.com/albums/t152/AFewBoltsLoose/Photography/Portfolio/LindaH-0082.jpg

2.

http://i159.photobucket.com/albums/t152/AFewBoltsLoose/Photography/Portfolio/Linda-Brick.jpg

3.

http://i159.photobucket.com/albums/t152/AFewBoltsLoose/Photography/Portfolio/Linda-Pillar1_Selective_Web.jpg

4.

http://i159.photobucket.com/albums/t152/AFewBoltsLoose/Photography/Portfolio/Linda-LookOff_Web.jpg


And finally an outtake that I liked.
5.

http://i159.photobucket.com/albums/t152/AFewBoltsLoose/Photography/Portfolio/LindaH-0143.jpg