nice, I bet you're a real hottie in person
Self-portraits are always a good sign of confidence. It allows us to be honest with ourselves and draw with just a 'hint' of extra comic book flair.
There's an expression..."If you were to be stuck on a deserted island, the only person you would have to get used to your own company."
I actually had a self-portrait once, but decided to delete it cause I felt it was 'too' exaggerated in muscle tone. I 'used' to be muscular. Now I'm a bit pudgy.
The artwork is anatomically correct, not too heavy on the shadowing where it may need it. Dramatic shadowing is what shines in comic book art.
And a crazier background would add distinction to your facial expression. Your appear calm, but the background could be bloodier.