After some final tweeking I completed the apple wedge that I translated from my painting class.
I found the process to be a great study in value, trying get the highlights and shadows that were produced by the light shining from right side. I find that I as well as my students tend to underestimate the darkness of shadows and the lightness of highlights. " Middle-valueitis" plagues us. I think I still could have gone further. But as my first teacher once said, "acknowledge and move on". It's always a learning process. I've learned for the next piece.