Teengamer: I'll say this plainly: the grass bits look terrible. Definitely use less squares. Squares can and do work for games like Mario, but with the RTP graphics, it simply does not look right. I also suggest using shift tiles (autotile + shift) to make it look more interesting as applicable. The areas you made it also make no sense - why would grass grow in a circle around sand when there is no water source in sight? I also agree that the campfire is a bit nonsensical, but I'll assume that you were out in the desert and just camped wherever you stopped. But then I beg the question: Why stop on grass? Wouldn't you rather build a fire on sand, which has little to no chance of catching? But more to the point: Your map is pretty boring. There's nothing terribly interesting about it, and when I'm playing a map I like there to always be at least one point of interest. I'd add more cliffs if I were you - a single plateau in the desert isn't unheard of, but it's not very aesthetically pleasing.
dylan: Definitely take those doors down one more tile. Not only do they not look good like that, but that's not the way the sprite was designed. I'd also use less of that shadow floor tile - it doesn't make too much sense in the doorway and most everywhere else it just sticks out. And then I ask: Is that second room just a storage room? If so, why is the player given access to it from the hallway?