Sorry - I know it's not really 'Psycho' fan art, but I couldn't resist. Here's an old comic book ad that I could imagine being something to inspire the character of Norman.
fan-art
photo
vintage comic book ad
taxidermy
This Psycho fan-art contains
journal, papier, magazine, tabloïd, chiffon, livre, anime, bande dessinée, manga, and dessin animé.