What I would really seek is not just a beautiful face, even though I'm instantly attracted to one. But I don't really want it. It's too much to handle.
What really stands out for me is their confidence and charm. And if it's going to be long term, I would seek something deeper than just compatibility or interests, or behaviour, or morals, or values, or the willingness to learn. That one ability should be the ability to have selfless love.