Got permission to post these!
I did so called "pitch artwork" for 2 Hollywood screenwriters, Gregg Chabot and Kevin Peterka. They are trying to sell a sci-fi storyscript and needed some promotional illustrations.
Had lots of fun on all the paintings!
step-by step for this speedpainting: [link]
You can see the perspective grid.
'Hyper G One' copyright - Gregg Chabot, Kevin Peterka.