Sherlock Holmes said
Honestly, I think going into personalities is far more telling about what a person likes than looks are. Physical appearances are fairly generic thing as far as attractiveness goes, but there are so many subtleties about personalities to consider that it makes choices far more specific. (For instance, someone can say they want someone with a good sense of humor -- but a sense of humor is a very specific thing because there are many varying levels of what a person can consider to be funny. If someone says they have a preference for dark hair or a certain hair length, it really only narrows the field of choices down slightly. If I find Monty Python to be hilarious and someone else doesn't quite get that type of humor, it'll cut the pile of potential mates down much faster.)
You could always make a thread for the psychobabble
It'll be great
Or horrible
Whichever