I always do it in subtle way and where I used to live women were more obvious and not afraid to make the first move on me. Now where i live women seem more passive and never make the first move. ive seen many girls that i liked in random places and i just get frozen i have no idea what should i do because sometimes im there just for short time and not sure how would she feel and think about my interest in her. Whats the best way to do it without being awkward?