Looks great! [8D]

Looks like you put some thought into the weathering. I like the way the exhaust looks, with the dark sooty color. Gun tube residue is well done! Overall, it also has that really dusty coating look to it!.

One thing you could do, in the same vein as the muzzle brake weathering, is to soot up the area around the turret exhaust fan on top. Depending on how long it has been fighting, build up around that area would look good. Both the German and U.S. had problems with high velocity ammunition propellant creating heavy smoke and fumes in the fighting compartments. I've seen photos of Tigers and Tiger IIs that have really heavy build up around the armored fan cover area. Of course, when it rains the soot streaks everywhere there is a path downward and it created streaks in places.

Awesome work!