Bart's friend Millhouse has a special look with his large teeth and blue hair. He is dressed to stand-out in a red shirt with a yellow jacket layered over it. His blue pants and shoes complement the look and make him the center of attention. To bring out the bright colors a bit more, I would suggest using a lighter and brighter yellow for the jacket, a peach or apricot color for the shirt, and a lighter blue tone for the pants and shoes. This will give Millhouse a cheerful feel and make sure he attracts attention.