I've been planning the few big backgrounds from the film today. These will work as the establishing shots of each new area and eachj needs to have its own distinguishing style.
The first is the opening shot of the park where Bubblegum Girl runs into some troublesome henchmen. The park itslef will be very heavily influenced by Japanese parks where you can often not tell that they lie in the centre of huge citites, and they have bendy foliage.
This second piece is the first shot of Bubblegum Girl as she hides out in the grimey back street of the city. I'm not so subtly putting a major plot point into this background, so hopefully it reads.