Hehe i like how you draw that amature drawig over the face. It looks well interesting. The ''background'' looks good very nicely detailed and the shading is very nice.
Yes the shading is just amazing. I have never seen something like this before.
It shows that you got a lot cretivity and it sure looks like you put down some work into
this one. So all i can say is great work i hope for more amazing art in the future ;)