Your understanding that the portrayal of the Báb and Bahá'u'lláh in works of art is forbidden, is correct. The Guardian made it clear that this prohibition refers to all the Manifestations of God; photographs, or reproductions of portraits, of the Master may be used in books, but no attempt should be made to portray Him in dramatic or other works where He would be one of the 'dramatis personae'. However, there can be no objection to symbolic representation of such Holy Figures, provided it does not become a ritual and that the symbol used is not irreverent. (From a letter dated 3 December 1972 from the Universal House of Justice to an individual believer; compilation ‘Manifestations of God and the Master: Representation of in Portraits, Photographs, and Dramatic Presentations’, prepared by the Research Department of the Universal House of Justice)