When you use the Find Faces For Tagging command, Photoshop Elements isolates and displays faces in photos so that you can quickly tag them. Thumbnails of individual faces appear in the Face Tagging dialog box, in which you can apply existing keyword tags or create and apply new tags. As you apply tags to faces in the Face Tagging dialog box, Photoshop Elements removes those faces, making it easier to find and tag the remaining faces. You can select Show Already Tagged Faces if you want the faces to remain after you tag them.