Question about Sci-Fi concept art

[Spiffy]

I'm gonna play devils advocate here and say you can learn a lot about sci-fi art by simply looking at enormous amounts of sci-fi art. Now, you don't want to be copying - but it is a good place to start just to wrap your head around some of the big ideas in sci-fi art, for instance: urban expansion, space travel, warfare, communication, and transporation are all very big components of contemporary sci-fi art, and studying these things in the real world will help your ideas and designs seem more plausible when you draw them.

Be inspired to explore, not derivative.