Great shots. I really like the top one, which looks like a palm tree. Not sure why it was so hard to focus? as fireworks are normally fired at a fairly consistent spot in the sky, but perhaps you were really close - almost underneath them - and couldn't count on them going to a consistent altitude. The second isn't as good as the top one because in this one I think it would also have been best to leave a little white space around the burst. Still, nice pix!

G