Personally I think you used a but too much cut swamp, and you used the same dirt tile pretty much over and over... I like to make it completely random. I really like the cliffs though... How they merge. This is the first time I've seen someone use those tiles for what they're meant for.
Good job.
Edit: One thing, on the cliffs right above and below the waterfall, there are shadows on the north side of that cliff, while all the rest of the shadows are on the south side. Could you not find a non-shadowed tile to go there?