The picture book is a very important segment in the life of every individual because it represents the first contact with books. As a rule, it is used for the age from the birth of a child until the second grade of primary school. There are many types of picture books and various criteria by which picture books can be divided. One of these measures is the ratio of the amount of text, ie words and images. Thus, the first division is into pure and pictographic picture books and into picture books with a minimum share of text and picture books with more text. Picture books can also be divided according to the shape of the picture book, so we distinguish between a toy picture and a non-tear picture book, interactive or pop up picture books and multimedia picture books. According to the content, they are divided into cognitive, artistic or poetic and problematic. Cognitive ones contain everyday topics such as animals, objects or games. Their goal is to help the child get to know the environment, what people are doing and expand their vocabulary. There are several functions of picture books, and they are information-educational, cognitive, experiential, aesthetic and fun. The word illustration comes from the Latin word illustris which means illuminated, bright shining, clear and remarkable. They are a very important segment of picture books because they can complement the story. In addition, they deepen literary thought, can give new meaning to picture books, free the imagination and contribute to the aesthetic education and development of art. Illustrations are a good basis for showing emotions, and they are conveyed by colors, lines and various styles and arouse excitement and the desire to actively read the picture book. Problem picture book is a modern picture book that deals with topics of everyday problem situations of children such as different emotions, health, behavior, family relationships in society and solving problems in which they find themselves, and for this type of picture book there are no taboo topics. Problem picture books about emotions are most often abstract style in which simplicity, imagination and emphasis on color and form of illustration are very recognizable, as well as naive style which is characteristic due to its two-dimensionality and looks childish in performance.