When establishing the art style of Bullfrogs, I told John I wanted something "colorful, but something that doesn't specifically read as a kid's game." For the cover, I wanted to see "a strong central figure or 2 in the foreground. Make sure there are some lily pads being fought over." Check out the various stages of development as the cover artwork for Bullfrogs evolved.
I really enjoyed the back and forth during this process. It took about 2 weeks go get a finished piece. John was sending me images daily to start with. I was always excited to see the latest update.