I'm not familiar with the actual tank so i wont go into acurracy.But, there are large pieces of your model that could not have been manufactured in one continuous piece, such as the hull or the turret "casing" or whatever its called. The reason why i bring this up is that your material is pretty uniform. Normally you would see some welding lines that form a bump in the paint, so the large pieces of metal would be divided in tiles. Given that the metal tiles wouldnt be exactly the same (probably manufactured in various locations) there would be slight mismatch in the color of those tiles, because paint transfers some properties of the underlying material. Again, maybe i am wrong and the pieces were cast into one piece, but i doubt it.Another thing is the lack of "grounding" features in the material. Stuff like rust in the crevices, leakage under the turret, circular scratches on the hull from the turret, etc.There are a lot of sharp concave transitions that look unnatural to me. In those instances it looks like 2 meshes are placed next to eachother or intersecting but with no "real" transition.Edit: the uvs can be overlapped a bit more i think, especially on the wheels and tracks.
Robert Berrier said:
Looking good. What would really bump up the piece is if you improve the presentation. Perhaps a small forest floor with some foliage like low bushes, grass and maybe a medium height tree.