The "Commandeur" of Don Giovanni? ... An apparition who lures the artist to hell?
A pencil version of this painting can be seen here.

" There are conflicting sides to everybody - and portions of oneself, that, even if not conflicting, do not share the same space at the same time[...]. But that isn't really the point. Rather, the idea here is to strengthen the self - to have the friend cajole the hater, to have the driven lead the weak; the point is to define things a bit better and enjoy the self." Randall