I don’t really use lines much anymore, unless the style calls for it. (ie: chars had thick black lines -> bg will have m too).
I sketch my scene, maybe do a color test. Then I extrude the shapes like this. I still need to work on choosing the right balance in not making the pieces look to plastic if they aren’t made of plastic, haha.
MAYBE YOU meant something else tho;; haha the pre-this phase or something.