I wonder whether he is consciously following the light, or the light follows him wherever he goes. The pointy, slender look of its body, makes me feel as though he is "moving on", but at the same time he isn't rushing ahead. Overall brilliant concept; I especially love the prisoners in the background.
The eyes are naturally drawn to the centre. Every line is there for a reason. Even the "scribbles" on the floor seem to guide one's eyes to the centre of the piece. Again, I wonder whether or not you create these features instinctively!