Lone Knight Before Colossal Stone Doorway

dcd@rkf@ntsy. Low-angle wide composition of a lone armored knight standing before a colossal stone doorway carved into the side of a black mountain. Two enormous horned faces emerge from the rock above him, their empty eyes glowing dull amber. A narrow staircase climbs through scattered bones toward the entrance while distant crimson clouds gather behind jagged peaks. The knight carries a battered round shield and a long spear, appearing tiny against the architecture. 1970s retro dark fantasy book cover art, vintage Dungeons and Dragons illustration, hand-painted oils, muted earth pigments, dramatic chiaroscuro, rough brush texture, ominous supernatural atmosphere.