I'll be the annoying counterpoint person - I quite like when fireworks shots include the foreground - gives them perspective and balance. For this challenge, and for DPC, probably a crop would be better, but to me that makes it kinda boring.
The city foreground doesn't add anything to the image, and is sort of ugly. The firework explosion is the focus of your image, and the crop should reflect that. Get rid of the other stuff and focus on that beautiful pink explosion!