She says she prefers to use a combination of two formulas, such as a pencil and a powder—this yields a thicker final appearance. “First, I fill in thinning areas with tiny strokes of pencil. Then I ...

To get them, Bobbi Brown makeup artists, headed up by Wendy Rowe, used this trick, which you can totally steal: Rather than just fill your brows in with pencil or powder, first brush the hairs upward.