Varies by one's perception of beauty. Some may like a person who is confident in themselves, and think that is beauty. Others like the bad boy who stays up pass their bedtime by one minute. And many other scenarios, personalities, and looks. To me beautiful is.....*Defines Wife*..
Depends really to one's preferences and perspective and definition of one's beauty. I know people who are dead in love with people I would never get anywhere near and I guess they can say the same to me.
It gets trickier. Since, as weird as it may be. I've never really had a standard to who, what, and why I like someone. A whole lot of it I believe personally is a matter of COMPATIBILITY.
There will be times that you are a good person, the other is a good person. Nothing can go wrong really, but then you realize that the two of you just don't have enough of what it takes to make it work. Just the lack of things that makes two people stay together in the long run isn't really that much which ends up in a sad contrast of personalities. Though it's not really that they're bad people, they're just incompatible.