Sharonsharon, are you a member of SCBWI (Society of Children's Book Writers and Editors)? You might want to join this organization. It can be a wealth of information for children's book writers and illustrators.

This is a picture book? I do not think you need an agent for picture books, at least not until after you get a sale. Most picture book authors I know did not have an agent when they sold their first book. Not that you couldn't go that route. Children's publishing is quite different from novels. After first publication is another story.

I would suggest going to conferences and workshops to get the manuscript in picture book length (800 words or less. It may be 500 words now.) Conferences will give you an opportunity to get the book in front of editors (or agents) for critique. It will also give you an opportunity to sell it.