If you are an illustrated and have been hired to illustrate a book, writers will often give you an outline (a list of notes that suggest the main actions of each of the pages of the book). Study it carefully and try not to depart from the author’s intentions. If you illustrate your own book, you have an unlimited creative license. Most of the famous authors hire an illustrator for a children’s book because this type of book has a lot of visual elements than a normal book doesn’t. Are you one of the professional illustrators?