I like the idea you are trying to go for but I don't like it. Here are a few things that might help:
For starters you have ground tiles that make the whole thing appear that it is off the ground which is ok to an extent. However, since you did this, it makes the rug (Idk why you have a rug) appear to go directly into a pit when it should appear to go off screen giving the illusion that there is
something beyond it. As for the rug, you should use a different colored sand tile (Reference EO deserts for buildings, objects, etc.
For the buildings I suggest you could switch over to the desert houses however those are too boxy in my opinion so the ones you have are fine. Could try putting in a door though to get rid of the black entrance and then possibly put down a tile or two to make it look like a shop floor (Or
whatever the buildings are supposed to be). If you are going to outline the buildings with the litter sand you should make sure not to cover up where the door is, makes it look neater.
River, I suggest a different color ground next to instead of the gray cave walls. I know there isn't much in the client however I'm sure you could find something.
As Tiduss said the benches should be moved back if you plan on letting players use them. The bench near the corner of the map could be moved closer to the river. Well is a bit misplaced. Why bother walking all the way around the river to use a well when the river is right there? Well could be
put closer to a building yet far enough away at the same time.
Missing 4 ground-wall tiles.
Could use a few desert rocks.
That is all.
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Former multi-server mapper.