I've been looking at the Osprey book on JG II. Profile #17 on p55 shows a tripe belonging to Ltn Wilhelm Schwartz. The fuselage is blue, darker than the regular light blue undersides and struts, but not as dark as the usual JG II blue fuselage. No personal markings showing. Wing upper sides are regular streaky green. Cowling is green for Jasta 13.
Best of luck,
Rick