>>5885604There is something called imagination, inspiration, that you can tap into. It's something that is more or less developed, depending on individuals, and that you can develop by drawing over and over, from reference, memory and imagination: you will slowly develop an intuitive feel for what is correct and what is not correct.
Start with simple forms, like cubes and stuff, and progressively add details.
I'm pretty sure that guys works only from imagination/memory, this is landscapes and rather abstract, but maybe that can help better understand the kind of internal process going on here:
https://www.youtube.com/watch?v=xGuYK6cxoY8 
