What problems should we pay attention to when taking portraits?

Portrait photography, it is best to use medium telephoto lens, fixed focus lens and zoom lens, but the medium telephoto fixed focus lens is better. A lens with a focal length of 85- 135mm is the most ideal, because a lens below 50mm is prone to distortion, tends to exaggerate the features of the face, and sometimes makes the nose look bigger than it really is, which is not recommended here. If you shoot with a focal length of more than 200mm, it will make your face look peaceful.