Intelligence can enhance it.
Many women, I have noticed, are not exactly beautiful, when you stop to think about it, but give the impression that they are. I'm sure the same is true of men.
Remember this?
"Scarlett O'hara was not pretty, but men seldom realized it when caught by her charm."I'm quoting that from memory; so I probably didn't get it exactly right.
There was an interesting program (a re-run I think) on TV the other night about the human body.
It made the point that Greeks of the classical period discovered that exaggerating certain physical characteristics actually increases beauty and vibrancy. This is why people in the art of the classical period are so much more beautiful and vibrant than in the archaic period--why they appear so alive. The artists improved on the normal by exaggerating certain features.
The program then observed that we do the same thing today in our own personal grooming. Women wear makeup. Men groom themselves in certain ways. In verious ways we emphasize certain characteristics and de-emphasize others to give ourselves the best presentation. We do these things almost instinctively.
I learned at an early age to be meticulous about my appearance--i.e. to dress for the occasion. If I were applying for a job I would arrange my appearance accordingly. If I were courting, I would focus on that. Etc.
Some people do this sort of thing better than others, and those who do it well are probably skewed toward the more intelligent.
This improves on "beauty" and gives smart people an advantage.
Good grooming (hair, nails, etc.) can make a huge difference. Just look at sites of movie stars without make-up. Shocking.