Here is my first render with TG3: the detail it's not great (I wanted to produce a more stratified effect on the cliffs, and the close terrain it's too noisy), but I'm happy because I could actually create the exact terrain layout I planned (with the cliffs leaning towards each other), add a distant planet, add external obj's (starship+astronauts), position them properly etc. Render took about 1h 30m.
Added a lens flare effect on the second image.
Cheers