I don’t know. I get women giving me clues all the time. Lots of smiles, but then I do smile a lot myself and it tends to be contagious. Mostly though women do expect the man to make the first move.
I hear guys all the time with the complaint that they are attractive but girls aren’t going for them. Sometimes I wonder who is telling them that they are attractive, like their grandmother. Being attractive is more than just having a handsome face. It also takes an athletic body, a confident walk, appropriate mannerisms, the ability to look another in the eye without flinching, and control over one’s smile and eyes and all that.
I’m good looking enough that I know there have been women who were greatly attracted to me but never showed any signs out of fear of rejection and embarrassment. Typically if I approach a woman and look in her eyes I can tell if she is attracted or not. Once I start talking to her, the attraction will be obvious in her reaction and the things she’ll say.
Most women have greater approach anxiety than men do.