I guess this challenge running over the weekend of the 4th was bound to be too tempting for you Americans! The best critique I could offer would perhaps be to study moodville's second-placed shot and compare with your own: the capture of the motion of the fireworks, and the detail of them is completely comparable - indeed yours are probably more intersting in themselves. It's the other elements that have put that shot up where it is and yours down here: some context for the photo.
One fairly glaring criticism though: why have you left that enormous black area to the left of frame? If I brighten my screen an awful lot, I can just make out some smoke there, but at a normal setting it's absolutley blank.I would hazard a guess that either you need to check your own monitor settings, or to be aware that a lot of people here have theirs set reasonably dark.
It's a good moment that you've caught though - intersting to see the different stage of process of diffferent fireworks. Two reasons immediately come to mind for the low score though: there were so many firewirk photos in this challenge, and without some context it doesn't obviously meet the challenge.
Not bad, fireworks are hard to shoot! I know, I was trying for my first time that night. The composition could be greatly improved by adding some surrounding scenery that in some way could enhance the fireworks. The better fireworks shots add a reflection off a lake, etc., for example.