Terrific splash page. With one image, Jack has introduced you to the basic premise of the series -- a police officer who is secretly the Guardian, and a group of misfit kids off on an adventure.
Notice in this close-up, there are characters from the other panels crossing over the square border of the frame. This creates a sense of chaos where the characters are so packed together within the various frames, they can't seem to help but stumble out of them and overlap. This style gives the work a 3-dimensional look, and probably reflects Jack's experiences growing up in the crowded streets of New York.