I saw that I would like to have a little more on the cloud side.
This is where Content Aware Fill came in handy.
I expanded the canvas on the image.
Then I selected the white area and ran content aware fill.
This is the result I got after a little work with the clone brush.
If you don't have PhotoShop CS5 the Gimp has a plugin called Resynthesizer
which can do the job. I remember having used it in Gimp several years ago and found the results to be quite good. And of course the Gimp is a free program.