The idea of the mask, the bolts, the sewn up mouth etc. is to show being held back.
The mask is stopping you from doing something.
Not only is it stopping you from doing something but the idea is that it's YOU that is stopping yourself.
I drew this then scanned it in to edit it a bit in photoshop.
I think you should still be able to tell it's very much a drawing and not over doing it with photoshop.