The idea is kind of funny (woman's reaction), but the horse makes the scene too serious. Now I think, poor horsey, he's killed .... If it was something like a unicorn it was still kind of cruel but more in a fantasy way/surrealistic, I think it would have looked more like black humor. Just my opinion though. Good luck!

Author, you have until the contest ends tomorrow to post a revision.

Ok, let's make believe it's a mini ponney (smaller than a ponney).
Nice image (a bit cruel, but nice)

I think the ponney is too little. Good use of the source image.

Good image, but either she's too big or the horse is too small.

sbs?
Other than that the girl on the floor seems flat..... it might be the background choice, can you find something smaller for a ground surface? the cracks are too big. Also her dress needs a bit of attention, while I understand fading out her spirit, i would suggest to make her actual body more solid to stand out.

SBS ?