Flapper makeup was very dark, contoured, and defined. Flapper girls were trying to look like boys, after all, so they frequently adjusted their faces using makeup for that androgynous appearance. Yet despite their intentions, their dark makeup ultimately became very sooty and sensual looking (perhaps from getting smeared after dancing late nights at a club?).
If you're planning to be a flapper this Halloween, take a look at this video to be guided step by step through how to create a very sultry flapper look with smoky eyes.