Painting a head in one minute is a good warm-up exercise. It forces me grasp the essentials right away.
Sequence: 1. Shadow shapes, 2. Background, 3. Halftones.
Tools: water brush filled with Higgins Eternal ink, a big flat brush with a diluted ink, and a sable brush filled with water.
Timer: an antique one-function electric unit by Cole-Parmer.
Reference: photo of Donald Tusk, President of the European Council.