Coloring boos must be such as to cause a positive emotional response from the child, encourage him to draw further. For older children it is interesting to color a favorite fairy tale character, useful educational coloring.
If while coloring your child goes out of the outline, it will not be so noticeable. When the child sees how cool his result is, it will inspire confidence in him and will be a good stimulus for further work. Good coloring are those with the text in it. The text introduces the kid with the game, the kid will be interesting, while the text will expand its horizons.