I love this drawing! Would you mind if I attempted to draw this? It probably won't be nearly as good as yours, but I would love to try. I just love their colors and their bone structures are beautifully colored!
I took a feathered brush on low opacity and went over my cellshading layer with white. And then I did it on select places (same low opacity and white) after I flattened the image. (if you want a more in-depth explanation I can give it to you)