This picture is really good and subject is quite common but in a way orginal. I mean there's a lot of christmas trees now on DA but this one is different than rest. It looks awesome I'm not sure if it's ice or glass on the picture it looks like very pure ice.
You set up lights really well. I like how light is reflected on christmas tree. Colours are quite good as well. Cold blue and warm yellow right are combined together and are unity.
One thing that annoys me is pattern on the curtain in background. In some places I can't tell where christmas tree is ending. But frankly speaking I'm not so sure if it's flaw or good point of picture. Some people would like it, for me is little disturbing.
To sum up. It's good picture I like it simplicity.