I like the colors and composition overall, but there is something about the border between the near shore and the water that looks very unnatural to me and it feels a bit grainy for me, particularly in the river. Actually all of those things seem to be in the bottom half of the picture. The falls and the far rockface look great to me.
lovely curves to the flow of water! The processing certainly brings out the colors, but somehow, personally, it doesn't fit. The brown water with the green grass, just doesn't seem to work together well. Perhaps, having left it in a sepia hue with a high contrast???