Due to positive response to the question should-we-allow-photos-to-be-posted-for-help-with-determining-the-date, @ColeValleyGirl suggested that we have a separate discussion on what supporting information should be recommended.
From that earlier thread:
- Location / Place
- Photographer's Marks, if present. Anything known about the photographer.
- Anything that is on the back of the photo -- include image of both sides if appropriate
- Anything that is not obvious from the picture: dimensions, embossing, type of paper, color of ink