When I began adding colours I wanted to add reference to London and so recreated some landmarks in vector form,
the above image is of the London University tower building, which plays a key role in the book, I also experimented with images such as London Bridge.
I found these images to cold and mundane and so began creating new images, such as fields and parks.

This is the final design I created, I simplified the image by removing the tree, making the back figures easier to read and  drawing focus to the cow.