Let's see... smart, loyal, affectionate, cuddly... wait, that's what I look for in a cat.
One of the most attractive qualities in a woman is curiosity. I like to be around someone who is smart, and who loves learning things. I like someone who is excited by life and wants to learn and grow for the sheer joy of it.
My other big consideration is kindness. I don't mean superficial niceness or charm, those are fine, but what's important is something that runs much deeper. I admire someone who cares about other people, family and friends, but also strangers and even difficult people. When someone cares more about doing what's genuinely best by others, not just what is politic or comfortable, they've got me.
Physical beauty is nice, but only to a degree. A woman who bases her worth on being good looking is not worth spending much time with, IMO. A woman whose looks are only a reflection of a beautiful heart, mind and soul is a whole 'nother animal. In fact, with that kind of beauty, what she looks like is not that big a deal.