Here's another update to my portrait of Martin. I have his hand complete, just need to make some minor tweaks here and there; but for the most part, the hand is done. I added tone to his fingers by applying graphite by making tiny overlapping circles (circulism) then blending with a medium tortillion, also using a circular motion to achieve a smooth blend. I then add another layer of graphite and blending some more. I repeat the process until I achieve the darkest value possible by applying a slightly harder hand pressure each time.
I'll be moving onto Martin's face as I focus on the shadows and try to manipulate the light. I will save the background for last since that will be completely black.