This evening I fixed the perspective problems in the knurled adjustment knob and then began “inking in” some of the darkest darks that have hard edges. Normally, I’d start by covering the entire canvas with a rough under-painting layer of diluted oils, but in this case, I want to retain the precise, dimensional nature of the drawing, so I’m marking key landmarks first with acrylic Mars Black and Raw Umber. These shapes will show through the initial washes of oil paint. I am being careful not to touch any of the darks that have soft edges. These softer, more organic shapes will be done in the next pass with oil paint.