There are many types and functions of picture books, but the indispensable feature of every picture book is illustration. Illustration is one of the main criteria for assessing the quality of the picture book itself. In a quality picture book, the illustrations are made in harmonious colors, they are realistic when explaining concepts and imaginative when they are in purpose of enriching the experience. It is important that the illustrations are of good quality because they greatly influence childrens artistic taste development. The question is whether children’s illustrations can be used for picture books and how do children visualize a particular text template? Many authors cite "rules" that should be followed to make children's illustrations as successful as possible. For the practical part of this essay is conceived the art activity "Child as a picture book illustrator - Drago Gervais: "Morčić", during which the children would take on the role of a picture book illustrator. However, due to the epidemiological situation, this activity unfortunately could not take place in the Kindergarten. As an alternative, examples of children's illustrations from picture books such as "If Snow White Were Small and Dwarfs Big" and "Good Malik: Malik in the Forest" are presented, described and analyzed. In addition, this essay contains a preparation for the above art activity where is fully described how it is conceived.