It must be because I fully deleted the nose while making the skin. I apologize, I don't know how that would be fixed other than editting the iron golem texture of the game to somehow remove the nose texture completely. I may be wrong on that because I have actually never tried using that skin on an iron golem, I don't know how it would be done. All I can think of is somehow removing the nose texture completely so that the game detects it as if there wasn't any nose texture. That's the only way that comes to my mind that could possibly solve the white nose issue.

I apologize for not being of much help, I wish I could have been of more help with your issue.
Please let me know if you are able to fix it!

Edit: I also apologize for the late reply, I haven't been as active anymore

Thank you! :D