Hi All, Original thread with comments about the rendering click here.
Solved I believe. After looking and looking (and looking (for what I remembered as a Glass Spider image)), I found this. This drawing offered was traced/based from a 1987 Rolling Stone cover that was reissued after Bowie died. The hairline, which looks wrong here and fails physically on our left, is totally different in the 1987 image as is the rest (he had a lot of hair over his forehead now removed). This also explains the confrontational gaze thing - he would never represent himself this way.
I have prepared an overlay so you can see what I am looking at:

1987 cover, "1996 self portrait', overlay...
Best wishes,
Eric