Hair: Color doesn't really matter. As for style, shortist, long, or anything but really curly. Slight curls work.
Body: not too picky with height, though 5 ft 1 inch is my limit. Thin, but not bony, but also not wider than me (I am in semi-muscular shape).
Face: I guess proportional?
Eyes: Not picky about color. Glasses doesn't matter.
Personality/stuff: Better be able to somewhat understand the scientific stuff I will say, especially when I go into a train of thought. Must be able to handle my sense of twisted humor, or else it won't work there will be too much awkwardness. The lady in question must also NOT be passive aggressive, or there will be problems. There is nothing more I loathe in a person is being passive aggressive. Being completely dependent is annoying, or very unworldly. Last GF was the last two, and it was too difficult to juggle between fraternal duties, and studies. They must also like to work out, or at the very least ride bikes. And lastly, I like videogames, they should at the very least respect that. Cooking, optional. I'm already pretty damn good at cooking, so it doesn't matter much.
Wouldn't really want another me with boobs. I'd already hard headed enough, and my temper does get the best of me at times, though it is 80% better than what I was two years ago. I'd hate to fight with another me.
EDIT: Blah, forgot to mention that the taste in music cannot involve pop, downer music, country, western, crappy rock and rap.
Picky? Perhaps.