I was out today testing out my new lenses and the cloud was making some beautiful light. I got a couple of shots off and have since processed them but, like most day shots, they look terrible. I just seem to have an inability to process landscapes not shot after sunset... 
Yeah the strong light may have a little to play but I was wondering what you guys could do to the same (slightly under exposed) file, see if I can get some tips.
Anyway, the RAW file for you to play with if you're interested.
And my attempt:

Yeah the strong light may have a little to play but I was wondering what you guys could do to the same (slightly under exposed) file, see if I can get some tips.

Anyway, the RAW file for you to play with if you're interested.

And my attempt:

.