Here's one more update.  I've started Martin's other eye.  This is going to be real dark, I'm going to darkening the entire paper and will try to bring him out of the shadows so to speak.  I'm still using a Pentel P205 mechanical pencil with a 2B lead.  I'm also starting to add a 4H and a 2H lead for the lighter tones on the face.  I'm blending with a medium tortillion and soft tissue paper.  I am overlapping my light and dark tone then blend them together to try to achieve a nice smooth transition from dark to light.  More to come soon!