Find brow powders/pencils/gels with a khaki tint to them- not red.
Because hair naturally has a khaki undertone to it, using a brow pencil that has a touch of khaki color will look more natural. For whatever reason, most companies have reddish tinted brow products. This color just screams “Fake!”
The best products I’ve found is Rimmel’s Brow Pencil in “Hazel” or Makeup Forever’s Waterproof Eyebrow Corrector in “O” or “2”. (0 is good for blondes or fair skin brunettes, 2 is good for dark haired beauties)