If the falls are fast flowing, maybe a bit more "noise"/whitecaps a few feet before the cliff ends and a tiny bit "below" the fall edge, but that's a personal preference....<shrug>.

The only other thing I can see is that the big rock in the center needs something... either a bit more texture/color variation or some more shading to make it more roundy.. right now it's solid "flat" with a flat color and just kind of sticks out in the close up.