Vanity, or the result of it, is a means of manipulation.
You think of Dorian Gray first, and I, for my part, first thought of plastic surgery, alas, so common today. But the issue is not from yesterday, appearance is something that has always been important, centuries ago, it's just the way the world is designed, and if we try to deny this importance, then we are still not aware of many fundamental things. So vanity is sometimes a lifesaver, and it's a virtue in my opinion, lol. Because people who rely on it have a different value system and... usually succeed in life.
I like observing, for example, the lives of some women sculpted with plastic surgery. To do such a thing, you must first have immense courage and be able to endure pain. They also probably have a strategy for life that always turns out to be successful. This may sound strange to you, but even I have been told by men that if I had surgery, I would be as successful as them. It's so simple. The same goes for men, by the way. Therefore, rejecting all other moral restrictions, I maintain that vanity is a good thing, a virtue that leads to success (said the person who no longer knows at all what things are, what is good and what is bad, what values ​​have things and what is life anyway...)