How to judge whether the forehead is wide or narrow? Don't judge high or low. I will judge the level.

Judging mainly by your face shape and your cheekbones, if the width of both sides of your forehead and cheekbones is basically parallel ∑, it is normal from the overall visual point of view that it is neither wide nor narrow. If the forehead and cheekbones are visually splayed, it means that the forehead is a bit narrow. In fact, many people have a narrow forehead. It doesn't matter, as long as it's not obvious, it won't affect the appearance.