Wikipedia states:
Death
Georges Guynemer in 1917
Guynemer failed to return from a combat mission on 11 September 1917. The previous week had been one of mechanical ills, in both his assigned aircraft and the ones he borrowed. At 08:30, with rookie pilot Jean Bozon-Verduraz, Guynemer took off in his
Spad XIII S.504 n°2. His mission was to patrol the Langemark area. At 09:25, near Poelkapelle, Guynemer sighted a lone Rumpler, a German observation plane, and dived towards it. Bozon-Verduraz saw several Fokkers above him, and by the time he had shaken them off, his leader was nowhere in sight, so he returned alone. Guynemer never came back.[6][7]
Google is your friend.
Seeing that those pics are of the plane he died in, the one in your pic is not from his place. There is no white stripe crossing the bird diagonally and the bird in your pic has its wings flapping up, the one on his Spad 12 and 13 had wings flapping down.
Also,
"It was not until 1916, under the pressure of the Great War in which aircraft numbers grew rapidly, that the association between the emblem and the unit became official. So that aircrews should be able to recognise other members of their own flight, in order to regroup after dispersal during fighting, the command of the Somme Combat Group, of which flight.3 was then a part, ordered that clear symbols be painted on aircraft. By this time, the flights had been grouped into squadrons. The squadron's commanding officer, Commandant Brocard chose to make reference to the Alsatian storks by using a white stork with lowered wings as the emblem on the Nieuports of no. 3 flight. He then ordered the other flights of the squadron to choose emblems using storks in other postures"
Guynemer was part of No. 3 flight which had its wings below the body. Official unit is Spa 3.
This piece of canvas your friend has belongs to Spa 103 which was the 2nd flight of the squadron
Here's a pic of Rene's Fonck's plane, of Spa 103:
That stork matches your canvas.
