It sounds inappropriate. Perhaps sending a photograph to the bishop may be way to get this rectified.
I am not aware of a specific instruction forbidding it. But this guidance may be helpful.
From the 2002 General Instruction of the Roman Missal (GIRM) approved for the USA, which can be accessed from
romanrite.com/girm.html :
“318. … Thus, images of the Lord, the Blessed Virgin Mary, and the Saints, in accordance with the Church’s most ancient tradition, should be displayed for veneration by the faithful in sacred building and should be arranged so as to usher the faithful toward the mysteries of faith celebrated there. For this reason, care should be taken that their number not be increased indiscriminately, and that they be arranged in proper order so as not to distract the faithful’s attention from the celebration itself.”
An image of a saint can be distracting. How much more an image of the devil in the sanctuary.