I decided to further relax the restrictions I place upon myself for my daily sketches but I felt that the changes were minor enough that I didn't need to start a new named series. I used two or three different brushes while doing this one, and painted with whatever shades of the greyscale spectrum I wanted to use. The only restriction that I'm sticking with now is the one hour time limit.
23 minutes once again without a reference. Didn't feel like doing highlights and shadows today.