Reminds me of the first Indiana Jones movie.
The terrain isn't that great because there's no doodads to help give that desert feel and the tile variation is... barely there at all. However, the hill variation, sky, and fog all are well done I think. The only problem I have with your hill variation is that in the center of the picture, the area where the road is is too flat. I suggest you make the road incline a little and pop out in different areas; make the road look rigid & bumpy. The temple is the main focus though, so I'll give you some tips and commentary on it:
Very simple but looks good. The only thing that I don't like is the stuff on top of the temple on the roof. Looks out of place and simply should not have been added. If you remove it or replace it with something more visually appealing (Like a statue or pyramid maybe) then it'd look a lot better. Right now, the top part of it looks random and is something that doesn't belong there.
~Craka_J