The first stage of shading was done in blocks to establish the forms and give a general indication of values. After the block in stage the details are built up one section at a time. The two faces are the most important areas so it’s a good idea to get those established early on. Next I will probably work up the man as he is on the left and I am right handed. If I work from right to left there is more chance of smudging the drawing even though I do use a sheet of paper as a barrier under my drawing hand.