Personally I don't think posting fake photos is reason enough to think it is for sure a scam. Although I would prefer them to post real photos I can also appreciate they might not want to post nude/semi-nude photos to an escort site. In this case it is understandable, to me, that they might post photos of a similar-looking, similar body-type woman but, if they do that, should be prepared for me to turn around and leave if they are not similar enough to the photos.