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Alien Resurrection (1997): USM Auriga, art by Sylvain Despretz.
Star Wars (1977): Alderaan Imperial City concept art by Ralph McQuarrie, February 1975.
Yes, the idea behind Bespin's Cloud City (The Empire Strikes Back) was one of Ralph’s earliest paintings for... "A New Hope", but it was for Alderaan - then capital of the Empire.
Revenge of the Sith (2005): Venator-class Star Destroyer in the battle of Saleucami, art by Ryan Church.
Remember that George Lucas did not finish the script in 2002. The artists had carte blanche (the "blue sky" phase), apart from a few indications at the start.
Alien (1979): USCSS Nostromo "Hammerhead" early design, by Ron Cobb.
Cobb: "Hammerhead was one of my proposals for a rotating spacecraft providing stability and gravity for the crew of the Nostromo." (Den of Geek)
Star Trek Beyond (2016): The USS Enterprise is about to enter the Yorktown starbase, concept art by Sean Hargreaves.
Revenge of the Sith (2003): Mustafar crash (unused scene), art by Ryan Church.
Venator-class Star Destroyer.