First off, It nice to ee the dragon having texture, even if you didnt do that scales. So many people make there dragon supper smooth skinned so it looks like they got plastic stretched over there body. I would say put some more detail in what he is sitting on, as it kind of looks like a brown blur. After that, I would say ether put more detail into the dragon him/herself or the rocks around the water fall. Perhaps add some foliage to the around the top of the water fall too. As for the water, that stuff is a killer to draw, at lest from what I have seen, so i think it would be best to work on other stuff besides it, at lest for now. Your volcano is pretty good, mostly cause it so far in the back ground. I would say clear it up a bit, but for all I know there could be some fog.