Picture Book Writing vs. Novel Writing

So I finished writing my first middle grade novel last month and wanted to share with you what I learned. Going from writing picture books to a novel is quite different, yet some things stayed the same. I made this Venn Diagram to compare and contrast the two. 

I'm a plotter, and so I sketched out each chapter and created my characters. However, my muse didn't always follow the outline, which is good. And as I got deeper into each chapter, my characters became more alive to me and even changed. I remember adding to their character sketches as I went along. My characters became a little bossy and sometimes took the story in a new way. And new minor characters introduced themselves that weren't even planned. I think it's a good idea to have a vision and rough outline to begin with and then let the story come alive and unfold as you write. I've sent it out to the first batch of beta readers. We'll see if it's any good. :)  If you have any revision tips, let me know!!