I'm not going to vote right away, but I'll explain why I'd vote for the following two
Number 4 is impressive. So many sigs look nice and flashy, but almost zero of them have any ounce of story. It took me a while to see what it was, but when I did it was amazing. The emotion in it is superior to all the others, which should be present when you're dealing with death. The colors could be a little more varied, but the aura around the tombstone reminds me of a spirit, maybe Mary Jane's spirit.
Number 5 impressed me too, because of that animation. Very neat, I love that part. But the other half of the sig is lost, and very hard to follow. I know what it is after looking closely at it. It's hard to pick between 5 and 4. The horse's head is amazing. But if you drew that, let me know and I'll edit my vote, because if you draw something and make it a sig, that's the best sig making out there.