Look at this intriguing contraption from Billion Dollar Brows that promises to deliver the most perfect of results. Really? It looks like a compass I used in geometry class- someone could poke their eye out with this... In my career, I have had to do a lot of tweezer interventions over the years on clients self shaping their arches. By accident you take a little more than you intended, try to even out the other side to match & pretty soon you've taken a lot of your brow off!
In terms of establishing a brow shape, I take an eyeliner & line it up with where a client's eye begins. This is where the brow should begin. The arch should be when you line the eyeliner in the center of the tip of the nose & angle it towards the hairline (see illustration). It's important to know that placement of an arch varies for everyone & you can't cookie cutter it. This is just the school of thought, since everyone's face & brows are different. I rarely if ever shorten the 'tail' or end of the brow, I just clean it up. It's important to be be conservative, since brows can thin as you age. I wax for a clean crisp shape, then tweeze to further customize the brow for the face. I truly think it's best when trying to define your brow shape to invest the money in having your brows professionally done. It's important to have an objective eye & an experienced technician that knows what works best on your face. Trust us!
Peace. Love. Brow Whisperer. M