I like the last one but i think you should straighten it out and give it a color boost. But other than that i like it alot.
I agree with loser101. Something like this maybe, although this is a little over the top, I tend to lose reality in pictures like this: However I like the sharpness in yours, the branches are all muddled in mine. Maybe somewhere in between:
Yes, they are handheld. The hoizon lines look pretty straight to me. I don't have PS loaded on this computer, so I can't go check for sure. The first one, the one that I did straighten, was actually a sideways sloped street. The last two were framed with the path of trees in mind. The horizon is hidden for much of the frame by the foliage. Adjusting for horizon would unbalance the foreground trees.