https://gamesartist.co.uk/old-pilot-mask/
Character Artist Zhao Hui provides a breakdown of this Old Pilot Mask & Hat. In this article, he talks about tools, blockout base head, med poly, sculpting high-poly details, UVs, texturing, realistic materials, lighting & rendering.
https://www.artstation.com/xuguangzhao
https://www.artstation.com/artwork/BXGB46