I'm probably not the first to notice, but the Omensmirk Mask is definitely similar to this medieval shame mask from Rothenburg, Germany, right?
"shame" is an interesting thematic emotion, considering the history of the Omen / Hornsent (or, like, Elden Ring as a whole). the omen seeing the face of their elders in their nightmares... omenkillers using that as a weapon... hmmm. tragic