A small update on this thread.
I started a small experiment on one of the zombies downed sprite (It's going to take me a lot of time to have them in different positions so for now I have one a little elevated with 3d in photoshop)
I'll get some downed versions on the sides and back too with different effects. I also would seriously love to have some of the downed versions like RTP basic ones too but I'm not sure I'll do them for now as I would need to redraw them from fresh :/.
Anyway let me know what you people think about it.
[Edit]
I made a more "3D rotated" version which I think looks better on the map but I'll just ask here for your opinion ppl if the one on the right looks better as a downed zombie than the left one.
(Wish I could also find a script on having blood remaining on the ground when hit but will see in the future.)