I like your response image. I think the erasing helped add a nice uniform tone to parts of it. Nice job with the nose and cheekbones. I often forget to but in the shading for those.
Ugggh. More hard studies, huh?
Ok, here are some hands. I tried to practice painting over all lines on some.
It was the first week of grad classes (ComSci), and I had to run around to figure out where all the buildings are, so sorry if I'm running a little late.
Bonus points for working on "rendering techniques." (Shadows & textures)