First let me say welcome to DPC! I expect you will find this place as addictive as I have.
Now to your image. I will be blunt. Its not good. I didnt vote in this challenge but I probably would have scored this low. The interest factor is low, I don't much care for the subject/composition. I understand the need for the long shutter speed but with it your trees got pretty blurry, probably due to any breeze. Just pretty rough all around. You did pretty much meet the challenge as you did catch a symmetrical design. Just flat overall.
That said, my first 4 images entered here were all 4 scores. Take some time and look at high scoring images, read the threads, study image descriptions, read the how to's and even ask members questions. This place is a treasure trove of information and you can find out cool ways to improve your work to score better here at DPC. But moost of all always try to have fun with what you are doing. This place isn't serious. We are all just vying for virtual ribbons. But you can learn alot, and make some cool friends at the same time.
Again - welcome to DPC and I hope you have as much of a blast here as i have.
Certainly meets the challange; exposure is good and I like the star effect on the light; but it lacks a subject, so ends up pretty flat. Would be nice if the trees were more in focus, too, but maybe that's motion blur? Looks like you were stopped down pretty far.