Pony Skull reference

These are my rendition of pony skulls from the MLP:FIM universe.

It's meant to be a reference for a certain comic I've got coming up. Feel free to use it yourself, if you like.  Though, citing this image when/if you do would be nice.

I used the following references for horse an human skulls, and adapted from there:
www.google.ca/imgres?um=1&hl=e…
www.google.ca/imgres?um=1&hl=e…
www.google.ca/imgres?um=1&hl=e…