This work is free of known copyright restrictions and is in the public domain.
Note from Joan Jessup, Pat's daughter (18 May 2020):
I suspect it is taken in Cottesloe, perhaps at my Grandparent’s home in Forrest Street.
It's not at their Broome Street residence as they didn't have a picket fence at that home.
The pine trees would support that thought.
Images
The 3 images below are linked to their canonical locations,
from where you can download the full high-resolution versions.
https://commons.wikimedia.org/wiki/File:Joan_Hall_and_Pat_Martin_(full).png
Full
https://commons.wikimedia.org/wiki/File:Joan_Hall_and_Pat_Martin_(cropped).png
Cropped
https://commons.wikimedia.org/wiki/File:Joan_Hall_and_Pat_Martin_(verso).png
Verso