On April 27, 1910, Pope Saint Pius X approves the Feast of the Image of the Holy Face, with Rite of greater Double in the Third Feria, after the Sunday of Quinquagesima (Shrove Tuesday) for the diocese of Cambrai, France.
Pope Pius XII may have extended the feast day universally.
As a child (1940's-50's)I too remember that Jesus' face was not to be shown in film.
However, Hollywood now thinks otherwise when it comes to Jesus.
But when it comes to the Muslims, Hollywood bows down and at the beginning of the film THE MESSAGE, the story of Mohammad, there is a notice that his face will not be shown out of respect yada yada yada.