Exposing 101
Just for anyone new to this exposing business here are a few tips to make sure what you're posting is above board.
So firstly its rather important to verify the person sending you the photos is the one in the photos, this establishes identity and ownership. A good way to confirm this is to get them to send you a special id photo with a date and some other identifier included. This can be as simple as a post-it note with the date and "Please expose me, user-id" written on it held up in front of a body part that is included in the main photos. The same info written on the body somewhere is also good if they are ok with that.
This is important as there are now laws in most places for "revenge porn" so you don't want to accidentally get caught in that web by posting photos from a jilted boyfriend or whatever. Don't post what you can't verify.
Once you have confirmed that the person in the id photo is the same as the one in the rest of the photos establish any other conditions they may want such as take down time and what site they prefer (if any) and make sure you honour any arrangements you make.