Started off with a simple line drawing to work out proportion plains and shadow shapes.
Next I refined my line drawing and add values. Start to render details like the helmet and jacket. Try my best to work out an issues with value at this stage, it makes it much easier when I move into color.
I create and overlay layer and block in the color. Next I flatten the image and paint opaquely over top of my color layer to refine details and add more value and color accuracy.
Add some transparent holo screens, a cool space chair and a big star window and I'm all done.