One of my goals as a writer is to get at least one picture book published. However, the picture book market is very competitive. Below are two blog posts and an article about how to structure a successful picture book. I hope you find them to be as helpful as I did.
“Concept book, concept book. What do you see?” by Bonny Becker: https://booksaroundthetable.wordpress.com/2017/02/06/concept-book-concept-book-what-do-you-see/?wref=pil
“7 Ways to Structure Your Picture Book” by Brian A. Klems: http://www.writersdigest.com/whats-new/7-ways-to-structure-your-picture-book (This article ties in with Bonny Becker’s article. I think of the seven structures as seven writing challenges.)