I like the concept, but I think you could push the action. Starting at the front, I might have the guy on right bent over some and actively coughing, with his hand in front of his face with the smoking fellow leaning back some with an annoyed look (oh the irony). In the second row, the action is a bit muddled. Obviously the standing woman is pushing against the kid in the seat, but what is happening with the mom and baby? I now see that the white tube is actually the mother's arm, and the kid in the red is holding on to it, but where is her hand. And the baby needs a bit more detail to be clear that it is a baby. In the third row, since you already have the guy up front smoking, I would lose the cigarette here, make the guy in gray heavier, and have him squishing the little guy with the glasses into the wall of the bus/train. Maybe the lady standing could be pregnant, thus making it more difficult for the kid in red.