OK, Tacobuff--you're halfway there--now you need to work on a little bit of weathering! (Sorry--you know I'm a "weatherhead"! )
The tank and painting with airbrush looks very well done. I had to do a second-take on your spare wheel color there--quite a difference from the base coat--what's your thinking there? Just curious?
Nice painting on the stars!
This would be a great tank to do some washes on--a black wash would do wonders for giving it some depth. With Tamiya paints, you won't even have to seal it. Just use some Black or Raw Umber oil paint, and mineral spirits.
On your tool heads, paint them blackish-gray and then drybrush with silver. The silvery color there that you're using is a bit stark.
Quite a nice job overall!