"Why has it stopped?"
The line popped into my head from somewhere, and then the image went with it.
So, I sketched it out, and being way too lazy to get the scanner out, I just used my webcam.

Then I had to crop that out and sketch over it in photoshop

Then I blocked in the lights and darks and worked it up from there

I liked the look of the circuits over his head and shoulder, but I thought they were too distracting so I removed them from the final image, but I left the ones on his fingers to indicate he might be scanning the guy or something like that.