Here's a monotype portrait of Lewis B. "Chesty" Puller, a legend in Marine Corps history (and an interesting face for a portrait artist to try and tackle!):
I'm pleased with the variation in tone and texture that the monotype process gives, and its sort of "controlled looseness". And though the portrait here is not perfect, I am pleased with the piece as a whole (notice the fingerprint lines in the black tones, especially in the eyes, which look a bit like engraving marks).