Measuring your contour to make it perfectly even! I started doing this a while back because I noticed the asymmetry in my face from sleeping on one side of my face for years (for me it was def noticeable)! I don't do this all the time,but when I gain major shoots and I know the camera picks up on things we don't see in person, I do this, or it adds the most improbable harmony to your face
Source: popsugar.com