Nice map. It's a little empty, but it's a desert, so that kind of makes sense. Still, I'd think the oasis would have a little more greenery around it.
Your use of wildlife is good, but I find that that map doesn't give any impression it continues in any direction, which is something I think is good to avoid when making outdoors areas. Simply put, it looks square and isn't well-defined. That might just be a personal preference of mine, but otherwise it is nice.
This map's not great. I'm not very good at interiors because I have problems filling space, so ... whatever. I made this probably about a year ago. I haven't been focusing very much on improving my old maps in my game because I am working on the action in the game right now. This probably won't be a map in my game without some major revisions, but I feel that I should post something, rather than just rating other people.