Nice idea, but a tough one to pull off with the extreme contrast. The sun seems strange with the funny shape and rimmed lines. I do like the sun rays you've captured coming across the clouds.
Unique shot to have the sun over the clouds. Thee clouds get a little washed out due to the brightness of the sun. It would be great if there was a way to see more texture and definition in them (not sure how to do it). The whole sky looks yellow which makes me think you shifted the colors to emphasize yellow. If so, I think I'd prefer it more realistic and less yellow.