Welcome, Cathy5, and daughter (Cathy6?)!
Which of Lewis' books are you all doing a report on? Or, if it is a generic report about Lewis himself, you might mention (and show pictures) of the Ents in the Lord of the Rings novels, whose personality and speech Tolkien supposedly modeled on his friend Lewis. Also, I've found that kids that age seem to be tickled by the idea that Lewis' life long nickname, Jack, was self-selected in honor of his pet dog.