Hi! Thank you for leaving this review!
The head texture replacing all body parts is an issue I personally can't solve unfortunately.. it's an compatibility in itemsadder emotes with any plugin that overrided the specific shader files itemsadder uses or shaderpacks loaded on the client (with iris or optifine for example)
Please refer to the wiki for more details and possible solutions:
https://itemsadder.devs.beer/faq/broken-emote-textures
I can't really do anything about this as I'm just the author of this addon, not the plugin, nor would I really know how to fix this lol.
I hope you can find a solution and get to enjoy the silly emotes I made! You also contact me on discord for any more questions or help: bruhwarrior (or twinky in the itemsadder discord)