Prosopagnosia , or face-blindness, is what you get when that centre is damaged or otherwise unable to perform its functions. This page is devoted to trying to explain what it can be like to identify the people around you using another centre of the brain, the general pattern recognition centre that most people would use to recognize objects like stones or twigs. As you can see, they are all possible to recognize by their individual features. All 5 photos above are of Matilda. Note that the hairstyles and cosmetics above does not cover any more than hairstyles and cosmetics usually do.
Different lights are also a part of everyday life.
Many, maybe most, face-blind people do not use cosmetics and hairstyling except when it is expected by society. Some individuals are often found together. Then it can be possible to identify one individual by its relationship with the other. For example, if Daniel kisses a woman with grey hair that looks approximately like his wife Lisa, it probably is his wife Lisa. Uniforms can be a big trouble.