Hi Steve,
I hope you don't mind some comments. I do a lot of images ni rainforests.
I find it very hard to photograph rainforest in bright sunlight. While the eye can see the more subtle changes in light the camera cannot and so contrasts become an issue. I try to almost all my work in forests with bright overcast light to even out the exposure. If not then you need to do a lot of post production work to flatten out the dynamic range.
The other thing you can do in-camera with forest shots is use a grad grey filter to reduce the brighter light on the tops of the trees (refer image 3) and also a polariser to reduce glare and saturate colours.
In #1 I would like to see the focus set on the middle tree from the right to move the sharpness forward. It appears that you focused on the middle tree which is much further back and hence too much of the foreground is blurred.
# 2 looks underexposed on my screen and could do with some more contrast but I you then run the risk of overexposing the highlights – see comments above.
# 3 is too contrasty. I can see the attraction to the shot but I would like to see some more detail in the shadows.
You can see with the shot below that even on a bright overcast day you need a polariser - which I didn't have with me on this occassion.
http://i26.tinypic.com/1420s4.jpg