The question is, are we happy to suppose that our grandchildren may never be able to see an elephant except in a picture book?

As a boy, I devoured comics but never saw what we now describe as a picture book.

A man's action is only a picture book of his creed.

In a novel, you have space to develop a character or a scene. You don't have that luxury in a 700-800-word picture book.

Jill showed friend Kay the cute white mice.
They liked to run races for cheese.
Mice were lots of fun to play with.
Jill said, "Take Poopsie, the male one, please!

A good picture book should have events that are visually arresting - the pictures should call attention to what is happening in the story.