First of all, I don't like most HDR images because they simply look over-processed to me and the processing draws too much attention to that aspect of the image rather than the actual subject content, so I'm going to refrain from comment on the editing technique and just look at the image content...
The subject (tree) in this photo holds a good bit of interest for me, but compositionally, I think the image needs a little additional help. The tree intersects with the horizon on the right side. Maybe a lower camera angle would create the separation needed there to pronounce the additional layers of depth that would give this photo more visual impact. It's one of those situations here where the subject could potentially stand on its own if it is worked properly :)
A bit on the subtle side, just a bit of the stereotypical "HDR look". I like the golden tones and the treetop appears to have a rectangular form that catches my eye.
This one confuses me. It almost seems too dark(part of me is dying for it to have a brighter focal point) but on the other hand that makes it soooo serene. I think I prefer it this way. Good Luck in the challenge. 7