Everybody sometimes have difficulties in expressing their own emotions, especially verbally. Emotions are more often and easier expressed using certain movements and facial expressions than words. Moreover, artistic expression of non-visual stimuli allows for the possibility of expressing emotions using colour, shape and line. In order to learn and understand other people’s emotions it is primarily necessary to know your own and know how to express them adequately. Through artistic expression using colours, children can get rid of negative emotions and show the pleasant ones which allows them not just to develop creativity but also facilitates emotional maturity and a higher degree of emotional intelligence. In that process you need to be acquainted with the development stages of artistic expressions in children. In this thesis and research the attention is focused on the connection between colours and emotions in children’s artistic expression. The research deals with the influence of certain emotions (happiness, sadness, anger and fear) on choosing warm and cool colours in children’s drawings which were expressed through drawings of “An Unusual Tree” which was taken from the story whose author is also the author of this research. The intention was to determine the representation of warm and cool colours and incidence of certain colours in the said emotions. The results have shown that most of the students connects the positive emotion of happiness with warm colours and negative emotions (sadness and fear) with cool colours. Emotion of anger, although it is a negative one, students connect with warm colours. The results have shown a substantial representation of brown, green and blue in cool colours and orange in warm colours. In order for the children’s works not to be a result of a subjective experience and observations, an analysis of children’s works was done which is accompanied with pupils’ commentaries and meanings of their own works.