xLights has endless options when it comes to effects, and at first can be a little daunting.
You may want to add some single stand effects to your arches to get home bouncing back and forth during a few sections of the song to add some movement to your lights if you think it will add another dimension to your show.
Similar you can also try some shockwave effects to your megatree star, or pinwheels effects to your snowflakes etc.
There are great free shared sequences, you can download them and view how some of the effects are created to provide some inspiration.
I found the colors on the faces distracting at some points like during the solemn part of the song. I like the no/dark outline but the pink? lips and yellow eyes were just a bit much for my tastes.