Oh wow an official reference sheet from me! That's crazy XD
I don't usually DO reference sheets because they're very time consuming, and I really do prefer action scenes and poses, that being said though, this one was actually fun to do! A good character, with some unique attributes I don't get to paint very often!
That being said, yes I do know what a cow/bull skull looks like, I altered this one to be a happy mix between a realistic skull and the skull reference the client provided c:

Anyways, I hope you all like it!

Character; foxxeh
Art; Myself (drawwithlaura)