Was the question primarily about "romantic" encounters, or what any woman might notice about any man, be it in business or social situations? With anyone, man or woman, I believe everyone plays detective to some level when first meeting a person. What kind of clothes do they chose to wear (or maybe they didn't chose), how do they sit in their chair, do they look at you in the eyes, do they let you talk, etc. On the subject of clothes, and as an aside, it is much easier, I find, for a woman to compliment a man on his tie, his watch, or his shirt. A man complimenting a woman, I suppose, might hesitate for fear of being accused of God knows what, in the US. I always marvel at how gracious Americans can be in giving and receiving compliments.