1.
I would bump your exposure up a few stops. The black rock in the bottom right, tends to drag the picture down. Either that or do multiple exposured, as I find that your trees are a bit too overexposed and the rock is a bit underexposed. Also a bit of saturation would make it a lot more inviting i think.
2. Personally I would have had the waterfall further to the left. With the waterfall in the middle it seems to isolated, instead of flowing. For a really abstract example of what I mean - The waterfall in your composition looks more like a brick, than a smooth flowing body of water that has an origin and a destination.
That wasn't mean to sound harsh by the way. It was the only way I could think of explaining it.
Actually, on second thought, perhaps you could reshoot the first and bump it down a few stops more than anything, to average and smooth out the lighting. Alter your white balance to try and warm up the greens and forest colours. The black rock, will still be a black rock, but the picture will average itself out with a little less harsh light.