Guerlain Eyebrow Pencil 01 Light. Guerlain has created its first double-ended eyebrow pencil, enriched with ceramide for denser and fuller eyebrows instantly and over application. A precise and angled retractable tip that does not need to be sharpened, to draw and fill in brows, and a brush for blending. The Guerlain eyebrow routine: 1. Brush the eyebrow upwards with the eyebrow brush. Then groom them outwards to give a clean line. 2. Redefine your eyebrows with the pencil.