I hope you take this as a compliment, because that's how I mean it. This makes me think of A Song of Ice and Fire. With the white walkers. Except that they're gross and scary, and this is very lovely. It's really beautiful. I like how the lighting is dark, but the "spirit" adds it's own light. I really loved this.
Actually they do remind me of a concept of White Walkers and George R.R. Martin quoted them as this once: 'The Others are not dead. They are strange, beautiful… think, oh… the Sidhe made of ice, something like that… a different sort of life… inhuman, elegant, dangerous.'
But they are confused with Wights, creatures re-animated by the White Walkers. They are like the gross ones.