the crash itself looks pretty cool, but once the ship stops and the cloud or dust/smoke move ahead of the ship it would seem like you put it in slow motion, what for? And then the dust/smoke simply disapears; shouldn't it fall down to the floor or mix in with the air? either way, your doesn't look like that, it looks just like if you had animated the transparency atribute, so it disapears in mid-air, and all at the same time.

(the crash was pretty cool though, I like the sparks/fire underneat the ship)