When wanting to create a strong and well defined brow, I would always recommend always using a quality eyebrow pencil. My go-to pencil is the Paul & Joe Beauté Eyebrow Pencil Duo (£14.50 ASOS / $24.00 dermstore.com). It features a lighter shade that delicately shapes and defines and a darker shade that fills in gaps and accentuates arches. It is a must for any makeup bag!