Brow pencil can look flat; that's where this gel comes in. Use it as a finishing touch to give your eyebrows more dimension -- it's almost like getting subtle highlights.
If you want your brows to grow (which seems to be the trend regardless of brow thickness), try this primer. It contains keratin and soy proteins to help nourish individual brow hairs. You can use it at night as a treatment or during the day as a primer for your other brow products -- it will make powders and pencils look more natural and even help them last longer.