Chiaroscuro is an Italian word used to describe the use of light and dark in a way that creates a three-dimensional effect. DaVinci's Mona Lisa uses this technique to bring her face to life. He also used a technique called sfumato which means blurring of lines - a softening with no sharp edges and a complete inability to tell where colors begin and end. When you follow the techniques of DaVinci, your face will always be ready for a "selfie" or the flash from some else's camera.
Slapping on a little bronzer in the wrong color can make you look clownish. So what are the right colors? Choose a color that's a couple of shades darker than you skin tone for contour. Shimmery pearls in gold, pink, beige or peach work best for highlighting.
You are working to achieve facial definition by following the premise that dark colors recede and light colors stand out.
First apply your foundation, tinted moisturizer or BB cream, but not your concealer. (You may not need much if you are contouring correctly.)
Now, depending on your face shape, brush your bronzer onto the areas like under the cheekbones, chin and jaw line, down the sides of your nose if you want a narrowing effect, temples and where the brow bone meets the hair line.
Next use your highlighter from the last third of the brow bone to the top of the cheek bone. Apply it on the bridge of the nose, but not quite to the tip. You can also apply it in the corners of the mouth to achieve lift and on the bow of the lips to achieve a pout. Put it in the corner of each eye to brighten and widen eyes.
Finally, and this is the most important...the true artistic touch...Blend, Blend, Blend. Think you've blended enough...blend some more! Sfumato (blur) those lines!