Mine ->


<- Yours
You could be doing a lot more with this I think.
All of it is made up of flat planes with curved edges, giving it boring shading. I'm having difficulty explaining this, so uhh, yeah, look at lighting on edit.
Outlines on fire and explosions are generally bad, since they're pretty much light themselves.
You could really expand the secondary lightsource, right now it's just some weird lines on the outer edges of the tank.
And uhh, the tracks on the tank should be flat on the bottom, because it conforms to the shape of the environment below it, and moves by the traction of the treads pulling it forward along the surface.