I'm showing Dark Shadows #1 (1968) from Gold Key. It’s drawn by Joe Certa, who might be just as well known as the artist on the long time “Manhunter From Mars” feature for DC Comics. Before that Certa had drawn horror comics for Harvey, so he was no stranger to the macabre, as this splash page of original art from Witches Tales #12 shows. (Thanks for Heritage Auctions for the scan.)
I don’t believe Certa used photo references for the characters. They look enough like them, I guess, to satisfy whomever was in charge of licensing the comic. Jonathan Frid (Barnabas) was a tall and distinguished actor, and in places in the comic he is drawn curiously stunted and out of proportion.
Frid crowns Miss American Vampire. This is the kind of job being a TV star of a cult show gets.
Maybe more than just Certa worked on this comic book. While Grand Comics Database gives Certa credit for pencils and inks I believe that John Celardo may have assisted with the inks. They look more his style. Just sayin'. You don’t need to bite my neck if you disagree.