Before I say anything, I'm not a photography expert by any means, I'm just buying my first DSLR and these are just my honest opinions, so this may not be the most legit "critique" but this is just waht I think:
I like 2 and three the best, I had no idea what 1 was before I read your comment, and even then it doesn't really look like fireworks. It'd be better if it was like the bigger fireworks, with the round, colourfull, and flower-y type, rather than a flare type if you know what I mean
I like the second one a lot, it's calm and relaxing, and I like the overall simple-ness.
The third one is good, but I think it might be better if it was either completely dark or completely light.
What I mean by that is like the people and the amps etc you can see details on them and IMO they're a little distracting? Overall I think I like the pic a lot, it really captures the moment
Hope it helps, and may I ask what camera you took these with?