Just another note about this sense of scale.
I get the impression that most TG2ers set up a scene with a camera and work away there without moving much. The scene has a focus they work on. You sense this in the final render. I don't work like this or at least try not to but it's hard. When I get precious about a view I move the camera. I think what is this planet like, what is beyond that hill, what will it be like if I move the camera miles over that direction etc. Then you have to think beyond a chocolate box scene. You also end up with an environment that gives you lots of material to modulate into other environments mainly because you are forced to make sure scales of things such as what happens in the atmosphere are much more corretly set up. One static scene with fixed atmosphere and lighting can look good then you move and it's all wrong.