That's pretty good.
I like the background.
Now, besides the hand, which will always be a fist in my mind, my biggest problem is that there's too much of the left temple.
It makes his head look huge.
FWIW, here's some quick touchup I did (mine on the right)
Biggest changes:
- Left temple (sides of the upper head should be about parallel) Left ear got a little bigger thanks to this
- Shoulder height ~ neck length
- Some touchup to the nose
- More subtle shadow around left eye
- Right eyebrow slightly thinner
- Right eye more "squinty"
- Upper lip made more straight
- Shadow over upper teeth