Understand that I mostly go for FBSM, I'm not a FS type of guy. So this is my criteria, it's mine so if your going to criticize - just move on to another thread.
First criteria is reviews. No reviews or a few bad reviews and it's next.
My second is a tie between looks and attitude. I may give a little on looks for an amazing attitude and I may give a little on attitude for looks, but not much. Looks are easy to see and reviews vouch for authenticity of picture. Attitude, well you've got to read a whole bunch of review and get to know how hobbyists do their reviews to know if your have similar preferences.
In the looks department, she has to be smoking hot. If I'm going to be taking any amount of risk and dishing out hard earned greenbacks, she has to be smoking hot and in good to great shape. Like no one I could pickup in a bar myself. Blonde, brunette, red hair no diff. Black, white, Asian, Latina, Indian, no matter. Beauty is beauty. And Boobs, I'm a breast man and they have to be spectacular. I prefer all natural 99% of the time, large (C+) and firm. (understanding that DDD's will naturally have some droopage).
Good massage skills (it doesn't have to great, if I want great I'll go to a spa). Good conversation and someone who is down to earth and doesn't think their pussy spouts liquid gold.
Lastly it's price. She could be smoking hot with Tits like Ewa Sonnet and the best attitude this side of the mississippi but I'm not going to blow $500+ for an hour and 2 loads. I'll do a double with 2 or spend 2 hours with one of my favs instead.
So I'm curious, why are you asking? Are you trying to attract more business? Are you losing business? Or are you just a curious cat?