I now have scanned an image take by Sidna Nourse of Ruth Carman, born 1907. The image isn't dated, and I don't know when Ruth married, other than that it was after 1927. This looks like she's 20-28 or so.
Drop me an email at email@example.com
, and I'll send you the image with the inscription "Portrait by Nourse Studio, Picton, Ont." on the matte, which I had to crop, due to its size.
The photos that she took of my spouse's mother are hand tinted, signed "Sidna Nourse", or "Sidna Nourse, Picton", but are under glass, and I can't scan them at this time.
There are two publications: The Ontario Photographers List - Volume 1 (1851-1900) & Volume 2 (1901-1925), by Glen C. Phillips, available from http://globalgenealogy.com
, which list the periods and places when photographers were active, but, once I looked, Volume 2 doesn't cover the dates when Sidna would have been active.