The basis for most of my color choices is from andre's Red coat.
When he is happy or jolly it is an intense red, when he is sad, dejected, it is normally cast in shadow. When he decides to throw the big ram towards the little ram, almost all color is taken from his coat.
Also pay attention to the lighting. Andre is sometimes completely flat, other times he has volume.
It's pretty out of control right now, but it's a start.