Very nice painting there. Clean and neat. The only thing I'd like to suggest is addings a bit more of highlights. The tanks, especially the black parts of them, still look a bit lifeless. I think you prefer the clean look on a tabletop army (as do I) so I suggest adding some scribblings and markings on the tank.
I like the bases you do. Intersting but not too overdone on colour or too busy with stuff. Those little conversions you did are very well done too and not too obvious or gaudy either. Keep up the good work!