We all have one of 3 natural eyebrow shapes. The arch, the arc (like a semicircle) and the straight line. Unfortunately, we are not necessarily born with the eyebrow shape that best suits our face, so we have to shape them. It is such a pain trying to get my dead straight eyebrows to form some kind of arch. But straight eyebrows only make my square face look squarer. Check out this picture to see which eyebrow shape best suits your face.
Of course it’s no surprise that for most of them, the best eyebrow shape is the classic arch. It is a classic for a reason.
So unless you have a long or oval shaped face, arch it up.