When is the polarizer used? Is it okay to take a portrait?

Simply put, cpl is to reduce the disharmonious reflected light, such as non-metallic reflection and water surface reflection. Its initial function is to make the sea or sky bluer and more transparent, which is convenient for landscape photography. In portrait photography, the polarization of the subject is generally not much, which will reduce the light of the eyes and is not recommended. For wide-angle portraits, it can be used appropriately so that the background is not exposed.