Picking out your perfect foundation shade among the many options at the drugstore is no easy feat. You can't sample the product, the color swatches aren't always accurate and that harsh overhead lighting is not exactly flattering. To help streamline the drugstore foundation scavenger hunt, we reached out to L’Oréal Paris celebrity makeup artist Sir John for guidance. Below, find his genius tips and tricks for taking the guesswork out of buying a drugstore foundation.