My only thought regarding the backdrop is that it could be from a summer religious retreat/camp.
The bell tents depicted on the painted backdrop - because that's what it looks like to me - are typical of those used by the military, especially in the Boer War and Great War eras. If I were a betting man I would place money on this portrait having been taken in a studio close to a military camp. Although I'm no expert, the clothing suggests to me a date of slightly before the Great War. If that's correct, then perhaps it was taken somewhere near a place like Aldershot.
Christine and Brett, thank you both very much.Brett I think that this postcard version of the photo might be a reprint of an earlier photo, in which case the time of the Boer War would be fitting.
No guesses from me, but it's a neat photo.