Unless you're a professional illustrator doing the pictures for your own book, you should not submit pictures with your manuscript. To do otherwise will mark you as an amateur, so resist the urge and you'll be showing the editor that you know the business.
If your story is accepted, the publisher will find a terrific artist for it, and you'll end up with a book that's even more beautiful than you could manage on your own. This is actually great news for aspiring writers. It means you can spend your time, energy and money on the thing you do best--writing!
In the books and websites on the How Can I Learn More? page, you can read more about the author-illustrator-editor relationship. It might surprise you to know that the author and illustrator rarely even meet each other!