I think that these images are less convincing than "thispersondoesnotexist". The network did well for the extent a tree is similar to a person: long palm leaves look are like green hair, and look passable.

The network did bad where it had to take into account global illumination, or distance to the object and its level of detail: 1) tree trunks are mostly flat and do not depend on the possible sun location; 2) shadows don't match the trees and the rocks; 3) nearby rocks often lack texture and are not properly illuminated (they look flat).

It's not surprising given that the method is fundamentally local (CNN-based). I think better results will be achieved when a generator creates a scene graph rather than a raster. Are there works which actually create a 3D scene (or use it as an internal representation)?