I don’t always work in the same way, but for this type of piece the ideal method would be to do a line drawing, then a shaded drawing, then a color version, and finally a painted version (of course I do this all digitally these days). Here I’ve started the painted version. Looks promising.
This is a screenshot, and I left the icons in to give a sense of scale, though this is shrunk down and the view wasn’t at actual pixels. But it still gives more of an idea.