If you're trying to depict an active duty tank, I believe you might have gone a bit overboard with the weathering, especially the rusted bits. It would be uncharacteristic for the IDF to allow one of their vehicles to get in that bad of condition.
Also, if you check out a lot of archived images you'll see that very few tanks ever get that much of a soot build up on the gun muzzle.
A small point of detail would be the bullets in the .30 cal can on the turret could use some color.
Hope this helps.