When applied right, contouring can define your cheekbones and jaw line, reduce the look of a double chin, minimize a larger nose, and lift sagging eyes. Its basically using makeup to highlight and accentuate your features. This is especially important for photos, as the camera tends to pick up shadows and highlights better than the naked eye.
How-To: Highlight and Contour Like a Model! | sparkle & mine
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Sparkle & Mine: How-To: Highlight and Contour Like a Model!