Here’s are some more roughs from Jack and the Beanstalk. In the first one, you can see I used the entire background illustration. 
One thing about doing backgrounds completely separate from any other elements is that I’m able to save time by using the same background more than once. In the image below, I used the same background as in the page above, but I zoomed into the shot so that we’re not looking at exactly the same thing. Using the backgrounds like this helped me to create more story pages.
Frank Grau Illustration 