Interesting topic, think it depends on your (meaning you as an individual) deffinition of beauty.
If you see someone walking down the street you might think "Wow, she/he is beautiful" though this does not mean they are "truly beautiful" because its an objective judgment.
Some people may think that beauty is just physical perfection but for me personally i would say someone is beautiful based on there personallity.
However i cannot say what features would make someone beauitful to me as i havent ever met anyone like that.
Im sure alot of that doesnt make sense, sorry for that but oh well.