first off let me say, being an asshole to people who provide valid cnc is one of the last things you want to do, especially if you want cnc.

second, the style of the head doesn't match the set, as stated by TPK.
Either go full Cartoon, or full realistic, the shadows are really badly made, reminds me of some of my early stuff.

this might help

don't ever use jet black to shade. (this is my opinion, you may be able to pull it off when you get better)