Hey! I'm a resource pack author and I also love this mod. Recently I've make a random texture for enderman that will change its texture size and model. This will make the head item only shows correct texture in hand, but the texture will be broken when you place it on the land. Thus I hope you can make it using another path of the texture to avoid this problem.
I also find the pack Fresh Animation will make different head model for the vanilla skulls and i've tried to make a head_enderman.jem but it doesn't work.

oh god. So i recently gave the enderman head a completely new layer (model). Previously it was directly using the enderman one. I did that so that it would be compatible with resource packs and EMF and obtained the opposite effect because the pack evrybody was using, Fresh, decided to decapitate enderman heads so my head would be blank.
What you are suggesting would be the opposite of this? I feel like whichever way i move it will never be compatible with packs one way or another

Uhh...i just hope the enderman head not using the enderman model. Because the EMF will not change enderman heads model in the latest version. And my pack changes texture size based on my custom model.😢

In the latest version it does not use the enderman model but a new one. It does however use the texture from it. Guess I can give it a new one at this point. Bet this way I'll get complaints from people using simple retextures saying that enderman head does not get retextured properly

added diff texture loc