Here is a colouring page of Susan Pevensie, the oldest girl of the Pevensie children and later Queen Susan of Narnia.
Susan Pevensie Colouring Page
Here are the kings and queens from the Golden Age of Narnia, for the kids to colour in. That's High King Peter, Queen Susan, King Edmund and Queen Lucy, and of course Aslan.
Here is a colouring picture of the Pevensie children from The Lion, the Witch and the Wardrobe, as we think they might have looked at the beginning of the story.