Canyonlands NP - UT

It's nice to have some clouds in the photo, and the composition is nicely balanced as a result.  There is considerable posterization in the clouds, but frankly I'm not sure what has caused it -- your processing of the land seems fairly routine.  I hope others will chime in and help both of us out.

I don't know what "posterization" means. I did use some software to simulate a polarizer. Maybe that's what is bothering you.