User blog comment:Maki Kuronami/Lesson 6: Aura and the Grim diversity/@comment-15586611-20130823015133/@comment-4773581-20130823044256

Theres some skintone clearly visible in the image. Grims don't have that kind of color. They're nearly all black, with the snakes being the only ones with any non-black on some place that isn't their mask.