Please excuse the small size of this mockup, but this is what I mean by just adding one or more Star Destroyers just above Cloud City to show more of their presence. One may also assume that the TIEs came from it to chase the Millennium Falcon after Luke is rescued.
BUT, not a super big deal to add either, I will admit now. I'm not fighting for it, but just wanted to place an alternate idea to having smoke and fire coming from the city.