User blog comment:ILuvAnime/Fairy Tail continue after episode 175/@comment-203.87.139.100-20130704065733/@comment-7418318-20130704090936

Kinana currently is only a waitress employed by Fairy Tail, not a member mage, thus she has no guild mark.

I don't remember ever seeing the guild mark of any of the others, but considering the bikini-like outfit (or the actual Bikini in Ryuuzetsu land) Bisca wears after the timeskip, her guild mark can only be on her back or feet (ankle-hight or below), otherwise we'd have seen it.