Gemme di Luce - Túrin Turambar, Ancalagon the Black, Fëanor

These characters are part of the Artbook by Eterea Edizioni : https://etereaedizioni.com/product/gemme-di-luce-artbook-dei-tempi-antichi/
which explores the incredible heroes of the first Ages of Arda in The Silmarillion by J.R.R. Tolkien