I like the lower cloud layer, I think this is the best of your recent posts here.
You might want to check 'AA bloom' in the renderer's 'extra' tab to take away the really sharp pixels on the trees around the sun.
A little fill lighting is also a good idea. I think you should really run with this image, it's a good one to develop further, in my opinion.

* EDIT: It appears, from your posts, that you use the free version of TG. Try going to the AA settings and use customised sampling(Max' non-adaptive) to get the best out of the AA limit of 3, especially in scenes like this that use lots of 'jaggy' objects.