@nakagg
Very nice for a first map. You've got great potential, and you seem to have a good eye for mapping!
But, like elarmasecreta said, the yellow house looks out of place. You could try recoloring it blue, but keep the buildings design itself.
Also: You have tile-errors in the paths on the route 1, and you shouldn't use the "upper-ledges", since they aren't really ledges.
Otherwise, everything is looking really good.
From a design point of view though: Since you said this was ON a mountain, I think you shouldn't be using trees around the town. Look at Lavaridge Town or Fallarbor Town in Pokemon RSE. Mountains doesn't usually have a lot of trees, but they do have lots of cliffs and rocks.