I didn't fill this book from front to back. Similar to how I work on separate pages and stick them in, I purposely filled random pages so that I could try the same idea different ways but not have the same thing page after page as you flick through.
This method also helps to view things in a different way. When the two drawings side by side were done days or weeks apart, there were different influences on them. And now they can influence each other too.
