One of the popular trends in the cosmetic world is contouring, defined as emphasizing shadows and light on the face, with some beauty sources calling it the “New Photoshop.” Unlike the dramatic contoured looks of the 1980’s, where the approach was to create sharp angles or hide imperfections, the modern approach to contouring is about bringing dimension and symmetry to all face shapes. According to celebrity makeup artist Beau Nelson, the goal is to create a subtle definition and not a noticeable look.
According to the ProTeam Color Consultants at Sephora.com. The first step of contouring is to recognize face shape, which are categorized in four main shapes:
Round
Square
Oval
Heart-shaped
Other shapes include oblong, diamond and triangle:

Before contouring, start by prepping skin with moisturizer and foundation. Next, the four basic steps include:

Highlighter- used to lengthen areas of the face and bring light to areas such as the center of eyebrows, under the eyes and lips and the center of the nose. Shimmer shades can be used.

Contour- choose shades that are not too orange or brown and avoid shimmer; matte colors work best and look the most natural. Apply to areas such as the temples, jawline, and most importantly, the cheekbones. For some face shapes, contour colors can be applied to the neck.

Blend- focus on keeping the points of light by blending the dark shades into the light shades. For best results, use a damp, egg-shaped sponge, such as the Beauty Blender , which provides precision, streak-free blending.

Finish- set the look with loose or pressed powder. Add warmth with a blush or bronzer.