Copyright laws

If you buy a copyrighted artwork like say a sticker or enamel pin, if I were to use said item comercially is that illegal

Heres my situation, I play guitar comercially and I'm wondering about the legality if showing others artwork by sticker or pin online or possibly monetarily, I dont have any extremely recognizable artwork, but I know most likely everything is not free of use and I cant even find some of these artworks

Legal to share, post?

Location: Washington