Millum identified 5 key facial expression theories used in magazines: carefree (smiling), practical (concentrating), seductive (confident yet reserved), comic (laughing or pulling faces), and catalogue (posed smile with no personality). Ferguson identified 4 female facial expression theories: chocolate box (half smile with barely visible teeth projecting warmth), invitational (eyes emphasized with hint of smile suggesting mystery), super smiler (full wide smile with teeth showing projecting a "look at me" mood), and romantic/sexual (dreamy relaxed expressions projecting sensuality). The document discusses research on how magazines use different facial expressions in photos to promote products and convey certain moods.