hrm, I honestly wouldn't know what the photo was if you didn't tell me it was fireworks. That's okay though. The problem is there is no subject, no focal point, no excitement. Most of the photo is black space.
Next time try a longer shutter speed when larger fireworks are going off. Find a point of reference if you can. Directly under them probably isn't the best location. Take a look at this photo (random one I selected from google image search)
Notice how you can see a lot of streaked light coming off of the fireworks. This was done with a long shutter, low ISO, low aperture and a tripod. The photographer obviously planned their location before taking the pics too. The Art Museum is in clear sight from a high vantage point, in this case probably from a high floor in another building.