Easy language is a concept that was initially designed for people with intellectual disabilities. Through its further development, its application expanded and its potential in application and work with people with dyslexia and language disorders was noticed. Easy language is defined as the simplest version of a language, precisely these are different variants of a standard language adapted in the level of content and structure. The purpose of shaping this concept is to include a person with difficulties in reading and reading comprehension society, removing or reducing obstacles in the availability of information. Although there is no official document in Croatia that defines the concept of easy language, the application of its principles has been implemented for some time in the educational system for the population of children with language difficulties and dyslexia. The use of easy language was also carried out for the purpose of this thesis. For the purposes of writing this paper, the picture book Diary of a Seagull Marko 1 was analyzed and a proposed graphic and linguistic adaptation of the said picture book was made. During the adaptation, the general guidelines of easy language are used with the adaptation of the specifics of the Croatian language at the level of the text itself. In addition, the guidelines for formatting and organizing the text, as well as the graphic appearance of the picture book itself, were applied. The picture book Diary of a Seagull Marko 1 was designed to be a part of the elementary school subject Nature and Society.