Looks nice. I think you should lower the contrast in the overall painting and direct it towards the focal point. It seems like it's an overblown photograph, but I'm not sure if that's what you want. Also, it looks like you detailed the middle rock so it will be the focal point. Maybe try darkening the sky and the rocks around the detailed rock, and then add some strong highlights on the waterfall beside the rock.
The depth is really nice too. I could see this working with multiple types of atmospheres.