Botanical Drawing II - third class

We are practicing chiaroscuro.  This is my homework this week.  Various shapes, a pear, folded paper, a curled paper ribbon, paper leaves.

Next class we move on to real plant material.  

Not at all satisfied with the above leaves, which look variegated rather than toned, I tried again.  And this time used three different pencils.  Not much better.  I look forward to the instructors demo of toning leaves.  I hope I haven't hit the end of the road already.