We don't have synonyms for pictorialism yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are pictorialist, pictorialise and pictorialize.
(n) :
(photography) A school of artistic photography that emphasized using photography to mimic certain styles of contemporary painting, that flourished in the late 19th and early 20th centuries
(n) :
Any artistic use of photography to imitate painting, especially using pictorial conventions.
(n) :
The theory that mental imagery is visual rather than based on language-like description.
(n) :
(photography) A school of artistic photography that emphasized using photography to mimic certain styles of contemporary painting, that flourished in the late 19th and early 20th centuries
(n) :
Any artistic use of photography to imitate painting, especially using pictorial conventions.
(n) :
The theory that mental imagery is visual rather than based on language-like description.