In your picture, look at the layering in the rock faces. It is very regular. The layering stretches across the entire face. If you break this up, so smoother or rougher areas peak through, it breaks up the regularity of the rock face. Making it more interesting. For distant shots, I usually don't worry about this.
If you use the same distribution shader, copy it, then use the invert shader option; more details and textures can be used.