Thank you, guys!
@j meyer: I think you need to explain this a little more...

@mhaze and Bob: I did some tests with the internal rock object that has some new features (see attached image). I added some image map shaders with cylindrical mapping and combined them with some procedural created surface layers. So actually
it is possible to create such rock objects in TG.
@Richard: There is a population of trees on the terrain below. For the imported rock object, which had already about twenty trees on top of it (that now serve as bushes), and some instances of ivy generator objects (with and without leaves), I added three more hero trees and the guy. Plus the flock of birds to the upper right.
@Ulco: I had this idea in mind, and actually I don't remember why I haven't tried it