1. 멋있어요(from adjective 멋있다) means cool and you can use this word about women. EX1.1) 방탄소년단(BTS) RM은 멋있어요. = BTS RM is cool. EX1.2) 정국오빠랑 화사언니가 너무 멋있어요. = Jungkook oppa and hwasa unni is so cool.
2. 예뻐요 means pretty EX2) 이 영상에서 예나가 정말 예뻐요. Yena is so pretty in this video.