In the field of Personal Image,
"Smart Beauty" means:
aesthetic self-knowledge, by learning some things about your colors (cool or warm, intensity, value, contrast etc.) and about your proportions (general mental patterns about ideal proportions)
smartly applying this information to your daily beauty routine.
This will help you rediscover yourself and get a visibly improved aesthetic result, as you will know how to highlight your strengths and camouflage those features that you consider weaknesses.
Smart, isn't it?