I've had pretty good luck. I go by pics that are high quality. If the images they use look like they are from a camara/phone with high pixels then I give them a try. I've found that the posts with pics that look like old technology, vintage like, are bait and switch/catfish/scams. I also don't bother with pics where the girls look like they are modeling for an adult photo shoot. If you see a girl in the doggy position, there is a good chance that it is a good one to try. I also stay away from posts that show the girls face. Most of them do not want their face to go public like that on a post for escorts.
Good luck.