Custom head texture goes missing after restart

[n1x4]

Sup guys, been playing around and 'trying' to make minor changes and figure I'd start with a custom head texture in CK. Well all went well but when I change my "complexion" in ~showracemeu the next time I load a save up it's missing back to deafult. I have to ~showmenu again and set it back. The process I used was simple, just duplicate a race head texture set in CK, change the texture path to my own and under the tinting tabs ADD my texture set. Works fine, UNTIL I load up a save.

 

Sorry for the n00b question but new to modding and trying to learn. Any thought?

 

Thanks.