I'm making progress, slow but steady. My approach to chiaroscuro may be a little different from some. I don't squint away pieces of the form and deal with the parts illuminated by light. I prefer to paint up to the edge placing a dark value next to a dark value and in that way I can achieve a dissapearing edge effect without losing the shadow color. I don't rub the edges together with a fan brush or try to blend them, I let the values merge of their own accord. I have a mistrust of certain effects that I see abused in the work of so many painters that I try to stear clear of any mannerist tendencies. I'm not saying one way is neccessarily better, it's just my own personal preference.