That's a question that can't be answered since it's different for each person. I personally find a woman with a dark sense of humor, quick wit and sense of the ironic quite captivating....red hair helps as well...
intelligence and passion.
As far as looks go.... I can't say something specific because it's all how someone carries what they got. She could be gorgeous, but if she slouches with bad posture, it takes away from her beauty. She could be ugly, but if she walks with pride and confidence, then everything changes.
bit of genes ,bit of chance and majority of self grooming!
Intelligence, wit, and beautiful eyes.