This portrait came out as something completly different from what I thought I would do, I first thought just to do a regular drawing of a face covered in shadows by the eyes and half of it, but then, when It was almost finished I just started to draw like a skull on the darker side of the face, is not a complete skull, but you can clearly see some bone structure by the eye and cheekbone and some rotten flesh in the cheek.
Rotten half.
Draft of this man´s face, I like to outline all the parts I will shade. here is the whole draft of the piece.
Vertical hatching of the shadows and a little bit of details to help me draw the expressions
Finished drawing of this man´s face. the dead half of the face.