First time shooting in Bulb mode (Fireworks from downtown last night)

[lindsey7682]

This is the first time I have ever shot in bulb mode or even shot fireworks. I played around with bulb on my "beginner" Nikon (d3000) as I like to call it last night. I absolutly love shooting in bulb mode now and would love to try and shoot a good lightening storm sometime. After shooting the fireworks downtown last night I did find it very hard to focus. It was very dark out and you didn't know exactly where the fireworks were going to end up. Anyways I just recently started to get into photography as a hobby about 6 months ago and would love some feedback on my shots from last night. I only uploaded 2 of my favorites but also included the link to the album.
Fireworks 2012 pictures by lindsey7682 - Photobucket