I've noticed the transitions to each tile is the same. Would this be an Alpha channel? If it is, I'm sure it could be "softened" so the blend is less noticable, especially the land to water transition. If it is could I remake one? I'm sure the land/water could be resolved here.
If it's "Coaded" ignore this post.
Also, could the "river" be alittle more wider, maybe twice or 3x as wide as it's current state, As it is right now it's as wide as a road.
NUTTZ