Here’s a gallery with all of the known concept art for DOTF
Here are some highlights from the battle of Coruscant:
Now having read the script, this is kind of funny. This is art of the “capital” of the FO, and there’s this big surprise reveal that it’s actually a ship that can fly. Well, if it looked like this, no shit.
Also, I should note that the art in that gallery comes from both the draft that has leaked and the later draft that hasn’t fully leaked yet.