Rolling Clouds

Rolling Clouds - Canon 1Ds3, 70-200 f/2.8 IS @ 188mm, f/5, 1/2500s, ISO 200.

I knew I was going to have fun working on this image in post when I took it. At the time I composed the shot I knew I wanted a B&W toning and to dodge and burn the clouds to accentuate its edges. I finally had the chance tonight. What do people think? What could be better?