I don't like to nit pick, but you said you were working on some things anyways...
I don't like the way the gunpowder streaks look like oil streaks. They're too well defined, if you know what I mean? They're too sharply drawn out (like straight lines) from each barrel. I think, rather, that you would get wider "puffs" of smoke residue on the wings, covering the entire bank of 4 guns, rather than 4 streaks for each gun.
It's an aesthetic comment, but I only mention it because you're redoing stuff.