My First Star Trail

I've been researching star trails recently and so I'd thought I'd have a go at it....and this is the result! Not bad for my first experience of taking such a photo in my humble opinion. It was taken in my backyard in Bulb mode with a exposure of around 120 minutes in the city of Wagga Wagga. I was a little worried about how it would turn out because of the night light pollution in the biggest city in the Riverina area but when I saw this result, I needn't have worried! I will have another attempt at a star trail soon. But in the mean time does anyone have any useful star trail tips?
P.S What do you think of my very first star trail?