It sounds stupid but my favorite thing about her was the way she smelled.
It was really no big deal, in fact it was just her silly shampoo, but I am serious here.
After she left, I wanted to buy that shampoo; I didn't care how expensive it was or how useless it would be on my oily mop top. I just wanted to be able to smell it when I needed to smell it. When I was sad. Or happy. Or just needed a good laugh. I never got around to finding a good enough excuse to let myself buy it.
Her scent was like a silent celebration of her. It sounds down right dumb, but that is what it is for me. Everytime I smell it a thousand memories come flooding back. Some are excellent, some are horrible, some are insignificant but nonetheless poignant. She doesn't know it, but I kept years' worth. I would have been more than content to have had the opportunity to collect more than that.
Sometimes I still smell that scent on strangers and it makes me want to get to know them.
I also liked her smile and her brown eyes but those are stories for another time.