Creating a character is not easy because these books have less text in it so the whole story depends on how your character is. There are several things you need to keep in mind while making a character. For example, what is their age group and the level of reading. There are cheap kids book illustrations who will work for you at reasonable rates. Though the rates depend on the types of illustration. There are several types like 2D, 3D, sketching you have to pick the one that fits with your story perfectly. Connectivity matters in story, don’t you think?