Hello
I don't know specifically for de Turenne's aircraft but markings at esc 48 were as follow:
The singing cockerel were similar on both sides of the fuselage (at least 3 sizes, the latter the bigger).
The individual number was repeated on the top of the fuselage. In late 1918, it moved to the left wing.
Generally, a circle(light blue? white?) was painted on the center of the upper wing. The radiator cowling was also light painted.
The artwork on the cover of the Osprey book shows the position of top fuselage number :
Gilles