it is hard choice.
See this text :
Hatami’s Films are Iran’s only Pictorial Heritage
Filmmaker Fereidun Jeirani is convinced that the late director Ali Hatami’s productions are Iran’s only pictorial heritage.
Speaking at a ceremony held on the anniversary of Hatami’s death, Jeirani said that Ali Hatami was an artist who can never be replaced, and that he will always remembered in history.
The memorial ceremony was held at the House of Cinema with Hatami’s lone daughter Leila and her husband Ali Mosaffa present. Many other cinematic figures and critics including Saeid Mostaghasi also attended.
The ceremony continued with the screening of one of Hatami’s masterpieces, an episode from the TV series “The Sultan of Sahebqaran.” The series aired in the years 1975 and 1976 on Iran’s national TV channel.

picturesque heritage

I do think this is the correct translation, since these are works on paper - could you not reword it to say 'holdings of manuscripts and works on paper / graphic works'. Perhaps then it would sound more natural to the EN ear.