Very nice . I really like the colors of the stones. Some of the stuff seem to be in a bit of a different style though. There is something with the contrast of the logs vs the stones which makes it look a bit pasted together.
Put some shadow under the logs to fix that layered problem there. Also I think with the talent you've shown you might be able to spruce up the mist clouds at the bottom of the water fall. Add some bubbles, make it look less chunky. Very beautiful art though.
Awesome! My nitpicks are also the water foam as Darth mentions and the shadows of the stones which could have benefited from some of the darker green shades or the deeper mountains to soften the pixels there.
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I don't like only the low details of the mountains.