clouds are done well, congratulations for that!
Now you need to let us see some more of the ground. Have you figured out how to increase the exposure?
TG2 works like a camera. Currently, the exposure is optimzed for the sky, so you may have to increase the exposure to make the ground brighter. You can also increase the GI strength on the terrain, but cautiously, it's easy to go too far with it.
Frank