That's a nice image. Terragen is a good way to get landscape backgrounds into C. C's capabilities in that area are a bit basic - although DGC's Ground Control will actually import Terragen terrain files if you were keen to explore all the possibilities. You can even use T to generate an HDRI map for environmental lighting and reflections. There's a tut thread in this forum some months back that I started. You might consider making a few rocks in C and adding them to your scene. At the moment IMHO, the mid-ground is a little lacking. Otherwise great!