3-hour life-portrait from a live model at the Drawing Club, of a monopoly-man-looking guy, straight out of a John Singer Sargent portrait. I tried to apply what I know about Sargent's brush style to this. He was very judicious about his use of detail, and only hinted at it where absolutely necessary. He could therefore make the viewer perceive a more detailed image by hitting just the right perceptive cues, and the viewer would unconsciously fill in the rest. He would have made a great matte painter.
And here is the process in Photoshop. It's starts with rough blocking, followed by incremental refinements.