It does not look that bad in person. I went for a heavy layer of dried mud and sand look.
I just kind of think of it as one that survived battle in desert, but got left behind because
newer and better tanks came along for it's crew.
No real problem with the photo, it's just the weathering details stand out so much more than they do under normal light and normal viewing distance.
The tank photos I have take (of all my tank models) could almost be considered macro photography. The lens of my Nikon is about 6 inches (152 mm)
from the model, so you get that high level of surface details.