On occasion, a provider permits me to take photos of them during a session. I always ask them if I can post them either in the BCD section or as a reply to the review. How explicit can the photos in the BCD section be?
Images posted in the public coed areas of the site, including ads and showcases, must follow the ECCIE Image Standards provided in the Forum Guidelines. There is some additional leeway given for pictures posted in private areas, but I haven't seen any formal list.
You could run the pictures by your local moderator staff (austin@eccie.net) to get our opinion before posting.