I grew up with '70s and '80s sci-fi art and that style still inspires me more than any other, so I occasionally try to replicate it. Not just the known artists like McQuarrie, Syd Mead etc, but the lesser known guys like Stewart Copley, David Jefferis. I wish there was more call for this sort of work, I'd be happy to do it forever.
This is two separate pieces I was working on, comped together (not very well now I look at it again!) but the result works okay. Apart from the painting, I later ran a sketch through AI to generate some more chaos elements for the city lights etc. and painted it all together in PS.