Superimposed face?
It looks like you drew the rough outline of the face and then concentrated on adding the facial features afterwards. I think from this, it just puts the eyes out of proportion with the rest of Nick's face and he looks quite weird.
I think that you could combat this effect by making it a little bigger - pan the shot out, take in Nick's shoulders and this would perhaps combat the effect of his 'thick neck'. I think that the hair is as wild as it looks from various of your videos, so not much could be done there, save for changing the style of it, which might take away from the whole piece itself.
Finally, there appear to be quite a few smudges in the top of the image - this can be countered by cropping the piece, before publication, to save on parts that look messy.
[Review Request Club]