Well, I think WillsBabe
just answered some questions about the photo, while likewise presenting us with a few more questions!
It would seem the time frame from the photo is even older than thought, then. Sometime between FC (1996) and INS (1998) or around the time of INS (1998) at the latest.
Now I'm even more curious. And I really want a larger copy of that other Riker photo!
To answer your Q, yes, that photo of Troi is from the cut scene where they where eating in the Mess Hall.