Direct output:
(http://img198.imageshack.us/img198/411/69479816.jpg)
Processed image with Photomatix, "default" processing
(http://img694.imageshack.us/img694/3461/38474823.jpg)
"Smooth skies":
(http://img685.imageshack.us/img685/8108/68863763.jpg)
Erwan
I am torn between the second and third renders. I like the second render for it's dark heavy clouds. The third seems to have better lighting overall. The first, the landscape is obscured by the shadow too much.
It's good to try different renders to see how things work out. Experiment, experiment, experiment!