I have the official "Outer Limits" companion and I can confirm that there was a sculpture made of "Chill Charlie" but he didn't photograph well under the studio lights so they used an actor with make-up instead.
"Chill Charlie" did show up in several pictures used to promote the "Outer Limits" first season.
"Chill Charlie" wasn't even supposed to be in the episode, but the network insisted on a "Bear", so the script had to be (re) written to accommodate the hallucinations.
Of note, the book says that this episode marks Sally Kellerman's first television role. Joseph Stefano had seen Kellerman onstage at a local theater and approached her after the show and said to her that if he ever became a producer and got his own tv show, Sally would be the first person he would cast. When it came time to film the episode, true to his word, Stefano cast Kellerman in the role. He named Sally's character "Ingrid" after Ingrid Bergman in a nod to Hitchcock. Based on this episode, Sally was immediately signed to The William Morris Agency.