Kuzetsu wrote:
As a model, I can't really help lighting standpoints and how the picture is shot.  Or can I?  If so, what can I do?

If you don't feel like you are getting enough direction, you can ask for it. You may have mixed success with this - some photographers go into a shoot with a lot of planning and can give excellent direction, and others work more spontaneously; it can be hard to get direction from someone who doesn't work with a lot of forethought.

If you feel a need to be aware of the lighting while you are on set, you can always ask the photographer where the key light is (I guess "main light" means the same thing).

Unless your photographer feels easily threatened, there is nothing wrong with asking whether he or she is getting what you are expecting. If you see the lens is pointed somewhere unexpected during an exposure, there is no reason not to ask whether the photographer has cut off your trailing elbow or the top of your head, if you want to get at least one full shot of that pose or look. If you have done your job negotiating the session, the photographer should know what kind of images you expect to have at the end and this kind of question won't be a surprise. And of course, you will know what the photographer is after, so you can accommodate that in turn. (Nb: I'm assuming this is a TFP or a shoot you have arranged and are directing. If you've been hired for a commercial session, it would be inappropriate to query the photographer about these things.)

In post, you can always request a little massaging of the images. For example, if you think the first image in the portfolio would be better if the levels on your back were brought up a little relative to the background, you could ask that be done; it is a fairly simple curves adjustment (which could also be done in levels, with the contrast slider, or in a dozen other ways in Photoshop, no doubt).

You might want to go after the first image in your portfolio again. You have your shoulder line about 45 degrees to the camera, and your pelvis about normal to it (straight on, in other words). Try putting your back more face-on, and tilt your right hip away from the camera about 45 degrees, watch how your waist shrinks in the resulting photo, and take some ibuprofen for what all this does to your neck (you will have to crane it even more to look behind you). Try several variations because getting this sort of thing right can be tricky; there is a fine line between nailing it and looking awkward.

Second and third and fourth images are potentially real winners if the key light was from the short side with a diffuse fill broad. That might go for the first one, as well; I wouldn't be sure until I saw it.

Hope this was helpful.