Using the wide, rounded-cut brush, apply the medium shade across the entire brow. You can mix it with the other two shades to adjust the color to your preference.
Using the narrow, angled-cut brush, apply the darkest shade in fine strokes to the brow tail and areas without brow hair.
Pick up the lightest shade with the wide, rounded-cut brush to blend and adjust the color at the inner brow, or apply along the bridge of the nose for contouring.