Contouring, while certainly a magical technique, can be a slippery slope that all too easily results in an overdone look. To make sure your next shade-and-light session is a successful one, we asked Ashlee Glazer, the director of makeup artistry for Pucker in New York, to share her pro tips. Need more chiseled cheekbones? Interested in a more petite nose? We’ve got just what you need.