That's an incredibly stunning render there. Faultless in terms of colours and tones of the textures and shadows. What does, and I'm not going to say spoil it because it doesn't really, shows up is the softness of your terrain, which looks like a draped piece of cloth. Could I make a suggestion of using a colour adjusted Perlin Ridge noise with a negative displacement, to put some cracks into those rock structures.
How long did it take to render?