you can't imagine the effort to stay motionless
In my view, the protagonist's face features and posture show the effort to stay motionless very well. On the one hand, the protagonist is standing in a loose, non-tensed manner (which might seem to be the easiest way to accomplish being motionless). On the other hand, the strokes of the brushes give this work an unsettled and restless atmosphere of motion. The fragmentary drawing of the protagonist accentuates motion as well.
One thing which is rather hard to see for me is your idea about the background. Its unobtrusive nature did not arrouse my attention at first. After taking a second look, I was thinking the protagonist was captured on a crinkled piece of paper. I could not conclude whether it was intended or not, which somehow confused me when thinking about your concept.
All in all, one can see that there is a lot of thought inside this work.
keep on painting
this took my breath away.