Emotions make us unique. The emotions we experience are diverse and complex and sometimes difficult to express verbally. Moreover, it takes a lot of effort to recognize other people’s emotions, especially children’s. Children’s everyday life is filled with different kinds of emotions. Artistic expression can be an opportunity for children to express their emotions spontaneously and through play, in order to understand themselves and others around them better. Drawing enables children to self-express by revealing something about themselves, their inner world and how they experience reality. Through artistic expression children can draw everything they know and remember, and also assign a colour to an emotion. Verbalizing the emotions of happiness, sadness, fear and anger through drawing is done more easily because children are familiar with these emotions. They are the reflection of their emotional state. In my research, I focused on the connection between emotions and colours in children's artistic expression. I explored four basic emotions (happiness, sadness, fear and anger) and how much impact they have on choosing cold or warm colours in free artistic expression encouraged by reading children’s picture books about emotions and talking about them. The aim was to determine the usage of colours in these works, their number and their relation to emotions. The results showed that children associated the emotion of happiness with warm colors, while negative emotions of fear, sadness, and anger were drawn using cold colors. The research showed that children did not mostly use red for anger or black for fear, as assumed. However, blue was used the most in depicting the emotion of sadness. A significant amount of purple, together with blue and green, was used the most among cold colours, and orange among warm colours. White was not used at all.