Eyebrow Tip: When you focus on every little hair, you don't keep track of the shape of the entire eyebrow. The result? Thin or uneven brows. Find a large mirror near a window, then step back a few feet to observe your face. Brows should be in proportion to your face shape and the placement and size of your features. Move closer to the mirror and begin tweezing. Step back after every few hairs to check the symmetry of your brows.