Helmet Texturing demo. The project files are available for anyone to learn from here: https://www.characterclass.com/helmet 
The Helmet HP model was made by Breki Thor, the hair by Hazel Brown, and the girl model and textures I did previously. I also did the model prep, UVs, bake, texture, and UE stuff and renders. 
https://www.artstation.com/brekithor_bt 
https://www.artstation.com/hazelbrown