Sketchbook Ink and Procreate. (Same idea as #75)
There are a lot of conflicting references out there for the Machine. There are drawings used in the show, conceptual drawings not used in the show, and the Machine itself which looks slightly different in various episodes. The recently published September’s Notebook has a nice foldout of various pieces of concept art and production stills.
Most of my drawings start out in black and white (or grayscale) and then color is added later. I considered adding color to this one (a splash of blue, to recall a blueprint come to life) but in the end I decided not to. It is possible to play too much with various cool apps that can add color.