There are many painters whose works tell a story in visual form. You can build your Storybook around the work of one of these artists, from Renaissance artists to Romantic painters, any artist who created art inspired by traditional myths and legends.
Online Resources: The Web Gallery of Art is a great resource for medieval and Renaissance art, and you can search for paintings on mythological topics (just go to "Search" and choose "Type: Mythological"). For modern artists, take a look at the Art Passions website! Wikipedia is also a great online resource for art history.