I don't understand how the explosion itself created a multicolored implosion of smoke. (rainbow) Though it doesn't make sense, at least it looks pretty.
Don't overuse your overlays bro.
besides that, shading is damn good as usual, seems more time was put into those individual clouds of smoke this time. (every single dark patch detailed) gotta say, it has the anime feel a bit more than usual. (feels like the smoke is curling inwards now instead of just fading off to the side or some shit. which..is great)