Here's an attempt at a tank I have been gathering bricks to build for a while. Sorry about the photo quality - perhaps better photos will be added later.
Inspirational sources for the build have been mostly T-model Russian tanks such as the T-90. In my own opinion I got pretty close but the rear section needs more work. Maybe when I have some more dark green bricks i'll look into it..
I know the main gun barrel is square but LEGO doesn't make 1x1 or 2x2 round bricks in the right color. It doesn't matter to me though, I think it looks kinda neat that way - like an added plate shield or similar.
Very nice tank buddy! And many thanks for your nice comments on my stuffs! Waiting to have done enough to publish the next update, may I suggest you to come over to see my last version with the front canons(the provided LDD file is already more advanced, if you've got the software, with side weaponry...) =) http://www.mocpages.com/moc.php/295836