I'm scheduling a session for our engagement photos in the next week or so and this is already going to run me about $200. I know it's expected to tip wedding vendors (photographers, DJ's, etc.) but are we expected to tip the photographer for the engagement session as well? I am not sure yet if we will be booking this photographer for the wedding. I do really like him, but I'm using the engagement session as a trial run before I decide because he is a little more expensive than I wanted. If I am supposed to tip, how much? Thanks