I like 1 better than 2. The tree has a cool secret hiding place in it that I'd expect to see a troll stepping out of. The angle of 1 features the tree better.
3 is cool, but what is it?
4 is a nice shot. I would have turned her slightly more into the natural light.
5 is a cool shot and a great conversion.
#3 is my favorite--the blue water in the background and the isolation of the pod is really cool...has kind of a tropical feel to it, i think
I'll have to say I'm not much on #5. It has really great contrast, and I like the tire, but I think if all the other stuff in the picture wasn't there it would be much more interesting.
And I agree---#1 shows the tree from a better angle
You should def. use #4 as a model again--she has really pretty eyes!