Compositionally speaking, I like the one on the bottom row, left-hand side the best because of its angle. The boat, however, is a distraction and your photos seem overexposed. Are you using a digital camera? If so,this sort of thing can be fixed!
I also like the first one a lot. With a bit of cropping and better light balance (which is REALLY hard to do on a sunny day with light spilling through the trees like that!) it's a winner!
I have to admit that as a guy, the pink tanktop holds my attention a bit better than the TRS shirt, but your girl looks good in dark colors.
On a different note, that's one clean truck! Does it have a dent or scratch at all?