Ask any makeup-obsessed beauty junkie the skill they're most confused about and most will agree: contouring is a bit of a mystery. (At least according to an informal poll in our office.) Contouring and highlighting, for the uninitiated, is the process of using bronzers, light and dark foundations and highlighters to accentuate the contours of your face. Contouring brings out your cheekbones, slims your nose, makes your eyes pop, and gives you an overall 3D, sculpted face that typically requires great lighting or highly paid professionals.

No matter how many face charts, Pinterest pins or photos of Kim Kardashian I study, I just don't understand how lighter- and darker-than-your-skin-tone makeup applied in stripes and shadows makes a photo-perfect face. But these five beauty vloggers have more than mastered the art of contouring. They cover contouring for round faces, dark skin tones and everything in between ... just about every type of contouring you need to know. Click through and watch these amazing YouTube tutorials for a lesson in contouring -- you won't believe the before/after transformations.