I don\'t play 40K, so I don\'t know all that much about it. However, I always see dreadnaughts in very static poses. Perhaps you could do something there. One arm/weapon raised in a triumph or holding a standard. I see alot of stuff done with the bases, but instead of just standing over a fallen enemy, the dread\' could be holding a tyrannid or a chaos marine in its fist. Depending upon how it\'s equipped, you could set a rocket at the end of a wire and wrap cotton smoke back to the launcher.
Alternatively, instead of a triumphant pose, you could have some fun with battle damage and turn it into a \'last stand\' vignette. The dreadnaught, heavily damaged but still fighting, is holding to the last. \'Course, I don\'t know if that would make for some bad mojo on the gaming table and set your dread\' up for defeat from here on out, if you believe in that sort of thing…