Mistress Ahn,
I should be the last to answer since I have made some poor choices in my days but here it goes.
I usually scan through the "favorites list" looking for my two main fetishes: Ballbusting and GS. If they are not listed there is really no point for me. This makes the Fortress difficult as no such thing is listed on the website (for very good reasons I know!). You girls are all so beautiful that I would not mind taking a chance anyway though. And very few dommes don't do at least ballbusting! The next thing I look for is my biggest turn-off which is anything related to penetration. If the mistress goes on and on about how much she loves that kind of activity she is probably not for me. Just the idea of her pushing me in that direction is a no no.
Then looks are of course very important and I actually look for at least a few pictures where the mistress smiles. It gets very old with that cold stare in every shot and a smile reveals more personality I think. I also prefer when a domme is teasing and playful rather than just barking insults in German for one hour! She could of course still be cruel and hard though! After that it is all down to gut feeling and maybe reviews.
Maybe I come in and see you someday Mistress Ahn??
/matt