I'd recommend making 3 tiles for the waterfall (or charsets), two for the sides and one for the center. Currently, the edges don't like up with the edge of the water tile, and having the edge repeat every tile makes it look more like a hydro-dam than a waterfall.
Also, there is no source of water for that waterfall.. It needs a river above it or to be faced on a cliff instead of in the middle of nowhere.