Ever felt that all the mobs are staring at you a bit too much? No? Anyway, I do, so here we are.
This resourcepack takes on the task to remove the head of every mob in the game.
Yes, that's it. Just this simple thing.
There are, however, a few limitations:

• Some mobs, like guardians or striders, don't have a separate head. In those cases the face features such as eyes and mouth have been removed.
• The mushroom growing on a mooshroom's (removed) head is still present, as the only way to remove it would be to delete the mushroom texture ‒ shared with the mushroom item ‒ altogether.
• The wither armor also shows where the heads would be, and I decided against removing it to keep this feature intact.
• Helmets remain untouched, since the player still has their head, so if a mob wears one, it will float mid-air. Same applies for snow golems wearing a pumpkin.
• Mob heads use the same texture as the according mob, so they're invisible. Makes sense though, doesn't it?

Also, do note that this is just the default textures changed, not the mob models. As such, OptiFine is not needed, but it won't work with other resourcepacks that change mob textures.
That being said, go have fun, and most importantly, don't lose your head! Cuz you're the only one having one to begin with ;)
If you find any errors or something missing, leave a comment.

Happy Halloween!