Which Came First

When you start to write a picture book, do you start with the pictures first or the story? My Friend Sergio Ruzzier says he most always starts with the illustration first. He and I both agree that the illustration must tell a story without words. In essences we should create word pictures. Here is a little narrative that I did. It was really fun. I just kept doing picture after picture to create a short story. I'm still working on it.