To create a thin line use the pointed tip of the brush. To create a thick line, use the flat side of the brush. To create a tight line: While looking into a mirror, tilt head 10 back, making it easier to see the lash line. Starting at outer corner of eye, draw a line to the middle of the lashline. Repeat from inner corner of eye, connecting to the first line. To create a cat eye: Start with the tight line as directed above. Create the perfect diagonal line for your eye shape by drawing a shor.