@Deltar: it's not my favorite. The planks stick out, there is random bone walls, yellow fire, and that ground doesn't work on that earth. Good concept though.
@Scay: I think you should take out the random huge mushroom. I like where you're going, and I think you should add bigger dirt patches. The small dirt patches aren't working. Also, I think you should make the part of the river that is south of the waterfall, and next to the sand 1 square wider. Finally, it may be a personal preference, but I don't like the wall style you used (and I definitely don't like the desert roof at the top). At any rate, it's looking pretty good.