Thanks for the suggestion, placing panels is quite difficult on these tiny tanks but I added some lines to give it some more texture and they looks a little less bland.
Overall looks quite nice, but I think that some details (like panels - see Donpachi or any other game with good mecha) would make tanks look a lot more interesting.
Looks like you may have used some type of filter/transparency feature for the tanks shadow, which is a no-no here. Sending back for correction.