I’ve suggested before that the barge should snap in the fashion of the Titanic but adding some animated falling figures would sell the explosion better. The barge seem utterly empty by the time the thing blows which doesn’t seem possible even if some of the court made it onto the sand.
For the throne room I’m not sure if some Ridley Scott style directional lighting would be possible though those windows.
It’s already be suggested that the Endor moon be visible through the windows which would provide some reflected light. There is also the native star and with all that swordplay smashing up electrical equipment there may be a little bit of smoke in that room which could make for some interesting light effects if someone was prepared to spend the time animating them.