This was such a fun project to work on! Since I don't usually draw monkeys I spent a little time sketching as many as I could.
I was trying to figure out their designs, different personalities and silhouettes. Throughout the book more & more monkeys show up, plus a gorilla, so it was challenging toward the end!
I also had this "brilliant" idea that I would have the background color intensify as the story progressed. (Otherwise it would have been the same jungle background in every single image, boring!) Here's a color script showing the background starting out blue, turning more yellow & green and finally orange with an explosion of color in the last frame of the story.
If you're interested you can take a look at the entire book here.