One wonders why the hard pressed Luftwaffe ground crews would go to the trouble of repainting the entire upper surface of the bomber in a dark gray--- taking the time to mask the canopy windows so they could spray the frames in the new color---before applying their black splotching. Is that a realistic possibility? To answer the question, here's a set of pictures of the actual plane which are light enough so you can see some of the details. The first shot features a close-up of our HE-111 in the foreground. As is fairly obvious, the upper surface was not painted gray. Rather, it has the underlying two-green splinter pattern, which has been covered rather crudely by all sorts of lines, crosses, blotches, speckles, etc. probably applied using a brush or brooms, sponges, etc.: