Generally speaking, if you're blonde go one to two shades darker than your hair color; brunettes should go one to two shades lighter; and if you're a redhead, picking the right intensity and tone is key.
If you're blessed with raven-toned locks, however, a coordinating deep black eyebrow product can not only look too severe, but can add a starkness to the complexion as well. Instead, dark-haired beauties, smoke up. Think shades of charcoal, soft black, gray, almost black, and even mahogany, deep taupe, or dark brown. Better yet? Customize your shade with a multihued palette, like Brow Powder Duo in Ebony ($22).