I assume these are fractally generated and there are at least three terrains in the picture. Pretty good, especially for fractal terrains, which are generally unrealistic. Some things look odd, but I think they have more to do with perspective and composiion. For example, some of the vegetation on the far peak looks too large for the distance, and on the far upper right, there is what looks like an overhang (might be an overly large tree). Such deep overhangs are inconsistent with the way the rest of the rock is weathering. What is the rock type you are trying to model? Is this an actual place? Do you have a pic with the atmospheric effects removed? Properly applied atmosphere and lighting can hide a multitude of defects.