In 1940 some movie stars became so popular among the coloring books industry. Among them Judy Garland, Betty Grable and Margaret O'Brien.
There is no artist, who would buy their children coloring books or taught to paint pictures. What does this mean? Coloring is a kind of framework, hindering the development of the imagination. They contribute to the formation of habits of the finished drawing, in which a flight of fantasy and free creativity is almost impossible.