Definitely a lot of potential! Very nice rock textures and a nice "natural" look to the vegetation too. The waterfall seems a bit overly bright to me given the lighting of the scene, and the soft upper clouds don't have much dimension or texture to them, but I do like the depth they add in the upper-left. For my taste I'd say leave the ground alone for now and focus on clouds/atmo, lighting, and then the waterfall, and see where that gets you. I think the lighting is even pretty close to on target already. This might not need a lot of tweaking to really shine.
- Oshyan