Tribute Portrait of Robin Williams WIP

Here's a work in progress image of my latest portrait.  This is a tribute portrait of Robin Williams.   I'm still making adjustments to the skin tone as I go along. I'm still using Pentel P205 mechanical pencils using 4H, 2H, H, B, and 2B leads. The light strands of hair are being "drawn" in using a Tuff Stuff Eraser stick which I cut at an angle so that I have a nice sharp edge. More to some soon!