Portfolio's For Children's Books
At the conference I learned the importance of book dummies. In the portfolio review I had the opportunity to include a book dummy. I did not include one only to find out that they are very important for a children's book portfolio. Art Directors (AD) are not necessarily looking for great writing skills, or even if they are the correct length. They are looking to see if you can pace a children's book, and break up text in appropriate places.
With Portfolios less is more. Even if it is only 10 images, if you are unsure about a piece don't include it.
It is easier for AD's to sell editors on an illustrator if they display a consistent style. That way the editors know better how illustrations will turn out! If you have more than one style have them on two different portfolios, perhaps even have a "pen"name (is it a brush name for an illustrator) for your second style.
I hope these posts are useful!