Hmmmmm, these are pretty good.
I only have a few crits/comments;
1) In the Forest Area, the water looks a lot like the grass, just a different colour. You should try to make this more uniqe.
2) With all of your tiles, they still seem a bit gridd-y. You've done pretty well there, but there is still room for improvement

3) The trees in the Forest Area also look like they aren't really rooted into the ground. At the moment, it looks like they have just been put there. Maybe adding a little bit of dirt around the base of the tree could help? Just fiddle with it and see what works/what doesn't.
That's all from me! Keep up the pixelwork!
-Krizmo