I've edited it so the composition is a better fit for a 16:9 wallpaper.

I took a vertical strip off the right side of the poster, then pasted it onto the left side, adjusted the brightness to fit, and then reworked the shapes of the clouds on the left side to hide the seam. This was pretty tricky due to the high level of grain in the image, so I'm not 100% satisfied with the result, but some tactical placement of destop icons can remedy that.
