I found another old sprite that I made and never posted, it needs work on the color and stuff, but I just thought Id post it for the helluv it and get some suggestions.
(http://img108.imageshack.us/img108/5829/hovertank1xj.gif) (http://imageshack.us)
Looks quite good for a base. One thing, most of your graphics are from the side, and seem a tad two dimensional. It would be better if you could make them more 3D.
I said the same thing about the jeep ::)
copy cat.