I like and agree w/ what EscapeArtist said, beauty is an "energetic" thing.
I feel happy for people who I know have hardships but somehow rise above it and make the best of what they've got.. And some people I don't know how they do it. On the other hand, I wish I could feel the same way about people who I judge as having no hardships.
Losing an arm I look at as a positive quality in a person. S/he probably had to endure hardships and therefore become a better person to cope..
i think any extremely goodlooking person though, if they become obese become ugly. no offense to anyone, i was fat once and this is just how i see and feel things. I don't judge obese people, but I would not become physically attracted to an obese woman. On the other hand, many not so good looking people can start working out and look good / sexy / better enough to be considered "not ugly" or even goodlooking. And this is also a positive quality because unlike natural born looks, you work for it.
You can change things physically about yourself, you may not change your face, but ugliness or beauty is also in the body, also in your energy. If you're a man, women may even find you more attractive if you had a "manly rugged ugly" face, instead of being a "pretty boy". Unless you have both an ugly face, have bad genes, and have a bad physical structure and physical health problems, then things get much harder..
But there are a lot of things I believe women / or men find attractive or sexy aside from just the face.. And vise versa, you can have a beautiful face but really ugly feet with 7 webbed toes each for example..
You can still work on the other things about your appearance that you can work on.. even just clothes, or really cool tattoos and cool hair.. Yeah its not real.. it's accessories, they're not you... but that's a silly line to draw.. you still become more goodlooking. period. there are many 'pretty ugly' people who know how to accessorize or present themselves so that they are totally the opposite, look at steven tyler.. ok he's a rock star.. but still if he wasn't he'd still look good. Look at Wendy o Williams of the Plasmatics... She is not pretty at all... But does she keep fit.