If the image is not exposed correctly, or the sky is flat, then you end up with a boring white space. That's why, if you look through my work, I rarely include the sky.
In this case, there were these great big clouds but it was still a really bright sky. this would make it all white. I under exposed the image by 2/3 stops to bring out the clouds more.
In post editing, I used split toning to bring out the clods and blue a little more.
Canon 5d mark 3
16-35 l 3.8
F 9 1/2000