Speed portrait of Chucky D

In honor of Darwin Day I went with the eponymous subject to work on my portrait skills (this is actually my first portrait in over a decade, so I have some room to improve). About ~90-100 minutes of work (barely qualifying as a "speed painting"), all on a single layer. Probably half of that time spent on the eyes and their attendant wrinkles.

It's based on a fairly famous photograph of Darwin, although the painting itself is entirely freehand, and done as much like a traditional painting as possible.