Make the unexpected pleasant. For example, one day in my last relationship I mentioned that I liked the way her face looked without her glasses. I mentioned that without her glasses you could see her eyes more clearly, and so forth. I said it tactfully and nice, and she didn't seem to react to it. However, each time after that, she always had her contacts in. I was surprisingly warmed by the fact that she was doing something that I said that I liked, albeit a two sentence nothing. I loved it.
Who knows really? We ISTJ's are a fun lot, lol.