I like #4 - nice off-center comp, background is lush and well lit - nice lighting on the subject to highlight the face
You could have used a little fill flash, or a piece of card as a reflector and gotten a little light under the chin to lift it - maybe worth a try for next time around?
Not sure what ISO you used?
Might be worth going up a few notches to a a higher ISO to get a faster shutter speed in low light conditions - given the lack of noise on the 5D, I'd be thinking 640 or 800 maybe, depending on how dark those woods were.