I spent some time working from reference, such as stills from a film (in this case, The Name of the Rose):
Or trying somewhat detailed sketches from various reference photos:
It's a bit lopsided, if you ask me. In my defense, it was really dark and by the candlelight I could hardly see my own image in the mirror, let alone the drawing. You can it was winter by the way I am bundled up in wool - when the power goes, so does the heating!
Under better conditions, a sketch of a pine cone, a challenging but interesting subject: