I agree with malhomsi that you’ve dialed in the likeness pretty well. And I see what you mean about circling back around to more of an authentic likeness rather than a stylized caricature. Honestly, I’d say Devin has a fairly ‘normal’ neutral face when he’s not yelling on stage, making it more difficult to caricature. It might have been an easier stylization process if you’d done the yelling version; more obvious features to exaggerate.
Authentic likeness is an admirable accomplishment in itself, even though technically the point of the exercise is to exaggerate away from realism. So I’m inclined to grade this submission C+. Certainly worthy of passing👌
PS: I’ve not heard of Devin Townsend before this. As a guitarist myself, I’m quite enjoying his skills via youtube vids now 🤘