Stephen I didn't get any further on this matter. If you don't get an answer remind me to take it with me on the 22nd of April to Walter Pieters, he possibly knows the answers...
I contacted the fellow who has the site Baldeqgle quoted for us. Here is his response.
"Hi Stephen,
This is indeed an interesting picture and if you could make a scan it
would be great. It shows pilots Kervijn de Lettenhoven (left) and Etienne Hage (right) at the nose of the Morane. Unfortunately I don't know were the picture has been taken but is should be in 1919.