The illustration is a big industry that is not limited to books only. It takes place on different mediums for different purposes. When teachers make different creatures with clay and make children learn their names, it’s also a form of illustration; even the explanation on blackboard with chalk and duster is also an illustration. The different types of tasks that an children's book illustration pricing performs include woodcutting, pencil illustration, charcoal illustration, lithography, illustration, watercolor, acrylic, pen and ink illustration, freehand digital illustration, vector illustration, and much more. Which is your opinion is the most commonly used type in book illustrations?