Most Helpful Guy
Initially it'll be her looks that interests a guy to spend time with the girl to see if she's worth spending time on.
Some of what I think are universal traits he'll be looking for in a woman once he's comfortable with her:
1. She's able to take care of herself
2. Emotionally stable
4. Enjoys life
7. Not a flake
Although, just like girls with guys, different guys are attracted to different women initially. Some guys might love piercings and tattoos on their women. Some might only date business women. It might even be as ridiculous as going for women who only wear red high heels.
If you're asking this information in hopes of self-improvement rather than just an opinion then here it is. I believe that if a woman truly believes herself beautiful, then she'll convince men around her that she is beautiful as well. If you see yourself as a prize, men will too.