Hi, I'm the creator of this grindnode! I think you've done a stellar job at this exercise, even spotting some really tricky ones. If I had to nitpick, I would argue the line on the face of the figure on the left follows the form shadow of the cheek, rather than the core shadow, which will be slightly further back (green). And perhaps the shadows on the arms are so subtle, I'd reckon they lean closer to just being form shadows. As an example, look at the back of the figure, you will see the shadow of the back (A) being broken up with another lightsource (B), resulting in core shadow (C). I wouldn't say the arms are wrong, but it is hard to tell if there is that darker/lighter part of the shadow there (and that is okay) c: | Artwod Feedback