That better? Now that i look at my first one, it is a bit.. lifeless?
I'd say it's better, but also the first one was not bad (but indeed I guess much would depend on the context). IMHO a different background would make it look better.
Besides that, just a couple of quick notes:
a) the light source is at the top-right corner, so it's a bit strange that the leftmost parts of the tracks, which should be sloping down, are highlighted so much (even more than the rightmost ones);
b) what's that ring on the left side? A lid? It's got some transparent pixels inside, so it strikes me as odd - but I could be just me as I'm not into military vehicles.
saimo