To fill in your eyebrows in the most natural way possible, always choose a tone a bit cooler than your own brow hair color.
For medium- and dark-brown brows, a deep, cool brown will make the most natural accompaniment.
Black and nearly black hair can be filled in with an almost-black pigment.
Barely-there blondes should look for ashy-gray eyebrow pencils and powders.
Golden blondes can embolden their brows with cool beige tones.
Light brunettes should reach for a midrange brown, a color that will very subtly strengthen medium brunette arches.