Nice use of trees and I like the upwards looking POV.
Since some talk was about lighting, textures etc I couldn't help but take that last image into Lightzone. This is the default relight algorithm in Lightzone. There are a number of settings in this but I didn't tweak anything. Sadly Lightzone is not under development anymore. I'll still use it but I'll look to see if any other app can do this kind of thing. It's all done in realtime non destructively. Absolutely nothing topped Lightzone. I find it to be a perfect partner for TG2. It has a number of effects. The levels of the image are handled by a "zonemapper" which is apparently based on some system Ansel Adams used.