Thank you unknown Spirit and Temperlyne!
I've a little more time to explain some of the symbolism here now. The Sidhe have their palms upwards to show they have nothing to hide. Instead of an angel sounding a trumpet for judgement day, the Sidhe are singing a true note of their soul. Through this, we can be judged not only on our thoughts, deeds and actions, but on the essence of who we are. The multiple figures are there to show that we ALL contain the spark of divinity, and should not have to look for an outward source for judgement.
There is also the idea ,which is mentioned in John Matthews' work with the Sidhe, of the note of our soul becoming perfect, and that is when we evolve into 'perfect' beings, so this card also indicates a stage of evolution in our lifes.
Hope that makes sense!