I used to believe people were born beautiful and there is some truth to it but even the people I've thought were most beautiful, if I look hard enough, generally I can see they're just normal people who spend more time on grooming, style, clothing, posture, presentation, charm, etc... Maybe they got lucky and some of it came naturally, not necessarily genetically though possibly but more like serendipity to gain those habits or skills.

Take the most beautiful person you know and see them when they're sick and they rarely stay attractive.

In any case it's arguably learnable. I don't know if this example will resonate but certain cities have a culture of beauty. Tokyo is one. People dress up to go out, at least most women do. I use to think it was either (a) they were born attractive or (b) the city attracted beautiful people. But, I've changed my mind. Instead the city culture has set a standard and people, in general, feel pressure to try to adhere to it.

I know it's an anecdote but a very attractive women once told me the only difference between attractive and not is effort. We all probably know exceptions but in my experience they are fairly rare. I'm not saying everyone can be a 10 on a scale of 1 to 10 but I'm confident the majority of people can be 7-8 even 9 with effort. Many of the most beautiful people I know, put them in drab clothing with no make up and try to remove your memory of their prior attractiveness and they just look like plain ordinary people.