Radiant, glowy skin is definitely in, but there are a few guidelines you should pay attention to when wearing shimmery highlighters.
DO use a highlighter shade that complements your skin tone for a subtle, lit-from-within sheen.
DO use highlighter in spots that catch light, and enhance your natural features: on cheekbones and temples, down the bridge of your nose, under brows, the inner corners of eyes, and above the cupid's bow.
DO keep your other makeup like foundation, blush and bronzer softly matte and shimmer free.
DO blend out highlighter with your fingers, a fan brush, or a damp makeup sponge after you've applied it. To avoid blobs of product and obvious makeup lines, make sure you blend any harsh edges of highlighter so it fades into the rest of your skin.
DON'T dust or blend highlighter all over your face. This is more E.T. than chic.