To accurately measure the starting point of your ideal brow shape, align the product along the outside corner of your nose with the product pointing straight up. This is where you will begin filling in.
From your starting point, simply rotate your pencil diagonally across your brow until the top end of the pencil aligns with the top edge of your pupil. This is where your ideal arch will be.
After finding your arch, keep moving the product outward toward the outer corner of your eye find the ideal tail end of your brow.