Well, they are either attracted to you or they're not. But you can make it happen either way. The thing that you should know is how to approach and how to back off.
Good Hygene should be obvious. If He/she dresses nice, then I would recommend trying to dress nice too. But just be yourself. Don't try to act like your someone your not, because Girls can detect that. They detect a lot of things, like lack of confidence. Also, work with your social skills. If your shy, it's a no go. But if you are outgoing and funny, then you will notice great success. OOOO, a big one right there. FUNNY. Women are really attracted to that. Sometimes they will over look looks, just because the guy is funny.
and last but certainly not least....DON'T BE A WUSS!!!! When I say wuss, I don't mean the lack of confidence when approaching a girl.
Have confidence, and make sure you have a job.....that would help. lol
Make fun of her. But let her know that you are just joking, and do it in a flirting way.
I get a girls attention when I talk to a her a lot, pay a lot of attention to her. Make her laugh, and be friends, make fun of her (not in the bully, immature way) and so on. But then the next time Im around her, I act like I'm not really interested her. Then she will be like "Hey, wait a second, I thought he liked me", she will then try to get your attention. Which then you will just keep cool, and don't act like a wuss around her. Be confident in everything you do.
I know, it may seem mean, but it works. It's a little secret that my sister told me, and I get a lot of success out of it.
Oh, and watch your body language.
Im not saying of this works with all women. But it sure has helped me.
Oh yeah and good luck!