You mean a wooden mockup of a jagdtiger put over a Pz IVEven better ,
Those are Panzerkampfwagen IV's disguised as Jagdtigers
The 512th were just painted dark yellow overallGoing by the pics, you can see netting for sure as well as shrubbery. As for the color's the vehicles are painted I could be a smart alec here and say various patterns of grey.....sorry couldn't resist. I really don't know as these vehicles at the end simply left the factory and sometimes fought just primed with undercoat. However, I can see two white kill bands on one of the gun barrels so I would guess that vehicle is not fresh from the factory. I would say yellow with all the trimmings.
I see some evergreen branches. For example, in the second photo, on the second tank in the row, when we look at the end of the tow cable and the spare track, it looks like small evergreen branches. Same thing hanging at the front of the tank, too. There's probably a mix of different types of greenery, but it makes sense. The surrender was in the early days of spring, so there wouldn't have been as much deciduous greenery available as evergreen. Plus, many areas of Germany abound in evergreens of all kinds, so it would have been relatively more available. So a mix, heavy on evergreens, and accounting for anything that was close at hand.... if it's nothing but shrubbery then I need to find out what kind...