That is the wonder of PS! My photos are almost all changed in PS. My landscape photo are level mapped. So that's the reason for the dark sky and the bright ground. No miracle just Photoshop. This photo made it on a CD cover of an american guitarist! I'm so proud. And it is one of my favourites. But it also is one of my really much enhanced photos.
I'm sure I've commented on this one before, but now that you uploaded the other one I have to say that I find this one more impressive. More dramatic clouds, and with the band of trees being narrower, there's more emphasis on the contrast between silver sky and gold field.
Pity about the huge watermark though, dA's huge thing ruins a picture quite a lot :/