Hogar, I think it might help if you specify what type of situation you are looking to "pick a submissive out of." Are you asking about how we act in public say a restaurant or bar ? I don't think that there is anything about a sub's behavior that can be "picked out" we're not all low on self esteem, we don't walk wearing black seeming submissive to the world or anything like that. We're all different forms of people - some of us have very prominent and influential jobs and are very dominant in them, others may be more submissive all the way around but I don't think for a second that there is any "one way" to pick out a sub and i would advise you to be cautious about who and how you're asking.