I have to confess to my ignorance I don't even know what Tryst is. However I am surprised by the way you approach this. Why waste your time looking at 100 pictures of mistresses probably most out of your area?

What will looks tell you anyway? Two people looking the same will most of the time be very different in real life. I would suggest concentrating on some publication covering well your area and trying to get clips of persons you could actually meet. This is the way you can find out best what a session could be like, short of doing it. Of course once you find an interest this is only the start.