Yes, yet another helmet! Probably the one that has the most detailed description of all (in "Narn i Hîn Húrin," Book of Lot Tales I). The Famed Dragon-helm of Dor-lómin, a mighty heirloom of the House of Hador worn by Hador Goldenhead, Galdor the Tall and eventually Túrin. Originally made for Azaghâl, dwarf-lord of Belegost, by the legendary Telchar of Norgrod. 2B pencil.
More helmet studies in scraps: [link] [link] [link]