the gold metal shader - i didn't paint any textures. I used only procedural, scratches and grunge textures. used masks to mix them.
the image from where i did get the bow base concept,
painted by jungmin jin /dospi
link: https://www.artstation.com/artwork/9yAEo
painted by jungmin jin /dospi
link: https://www.artstation.com/artwork/9yAEo