Well any image can be scanned - but if you do not have a scanner, then it may not be convenient for you to scan it. If you have a photo of a portrait in a frame, that can be scanned. If you the portrait in the frame itself, that can also be scanned.
So exciting for you guys to connect. I hope your grandmother will be able to tell us if Friedrich Gottschalk and "your" Anna Gottschalk Scheffel were siblings! (and even who their parents were...?)!