Safari Zone

[MeekRhino]

These are my two zones, at their present condition. I think they are done, but I need confirmation or critique. The desert section is not my creation, and I do not have the file.

EDIT:

This is a work in progress (Grassland/Ocean)
I need help in the following areas for sure:
1.) It's sparse. Should I add more grass? More rocks? More houses? Something else?
2.) There are two places where I could not come up with a way to block the edge of the screen (so the player can't walk out). Any ideas as to what I should put there?