I have done many of these pizza shops for another MSC, and yes, the photos have to be just right. That is the client's mandate, not just the MSC's. I have found the easiest way to get great photos every time is to take the photos outside, in daylight. Just be sure the angle is correct, and whatever they want in the photo is in it, and anything they don't want is not. (No fingers, toes, faces, addresses, pets, etc.)
I use an i-phone (even though they do not recommend it) and have never had any rejections when taking the photos outdoors. I suggest doing that in the back yard out of view though, otherwise your neighbors may "Baker-Act" you due to what certainly would appear to the non-shopper as bizzare behavior!