It's looking pretty nice, but I think it would look better if the colour usage on the top parts were more distinct from the bottom - currently I'm finding parts of the barrel aren't immediately readable against the base of the tank (the blue, ridged part of the turret in particular - it kind of blends into the grey lines on the base.)
Of course, the shadow and independent movement of the turret will help a lot with this, but it might be worth try to separate the two pieces by using slightly darker colours on the base and brighter colours on the turret. The older, red version was actually slightly more readable to me because the only place the brightest reds were used was on the round part of the turret.