As promised, here is the new version of my background for my 8 minute animated monstrosity.
To compare, I've also included a (composited) frame with the original background. Now you can pick through and see what I've changed! Some of the changes are obvious, like the colors of the sunset, while others - dealing with adjusting opacity layers, blurring, etcetera - are a lot more subtle. The person who finds all ten changes first wins a cookie, subject to my schedule. (Hint: the step in the foreground and the people don't count as changes to the background).