Thanks everyone for the feedback!
Nepster, I made some edits to the trees with your feed back. I think your right about the leaves.
Now the leaves are more solid, and I used a darker color to blend them together, so you really can't tell the difference.
Right now, I think I'd like to add a few more smaller terrain pieces to make it easier to work with. Right now, I have a lot of large objects, which makes level building a little tricky.