Professional antiquarians and collectors will have a personal scale on which they rate the quilt. You don't need to, but you might record instead if it is your favorite or most prized quilt. Estimate the date Give specific dates if you know them. If you aren't sure, give the dates you have owned it. You'll need pictures of the whole front and back, as well as several close-ups of the details and workmanship.
Natural light is best.
Take more pictures than you think you'll need, shoot a whole roll of film. You can pick the best ones after they are developed.