EUREKA! The Cat and the Canary remake with Bob Hope and Paulette Goddard (1939) uses the portrait with eyes gag! I was looking at the original silent that has no such gag, but the remake has it! So that makes three films so far.

I'm still leaning toward the Genius at Work mask (apparently a leftover prop from RKO's She) since it is something Lugosi would recognize as from one of his films.

DK