It is not bad for a first try. Maybe adding more variety would give a better look to the map. For example, don't make the dirt path too straight and outdistance more the houses with the red roof. Also, that fence doesn't make any sense placed there. Fill that empty space with some decorative tilesets instead.
You've nailed the ground in terms of detail, but the tiles you're using are meant to convey that same amount of detail underwater. I'd recommend either switching to opaque water or adding rocks and such under the water's surface