The Beast is a menacing figure, so give him colors that evoke danger and rage. His fur is dark and tattered, so use deep brown shades with hints of black and gray. His eyes should be bright yellow against a stark white. His hands and claws are lifted up, suggesting a warning, so use vivid colors like orange, red, and even purple to convey his menace.
Belle looks fearless against the Beast, so make her colors light and airy. Her blond hair can be a stunning gold, and her dress a deep blue. To make her apron stand out, use a bright, dazzling white. Finally, for the background, pick colors that bring out the danger of the Beast: a deep, navy blue, with splashes of orange or yellow that suggest the Beast may be ready to attack.