We don't have synonyms for picter yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are picker, pitter and pictor.
(n) :
(archaic) Pronunciation spelling of picture. [A representation of anything (as a person, a landscape, a building) upon canvas, paper, or other surface, by drawing, painting, printing, photography, etc.]
(n) :
(archaic) Pronunciation spelling of picture. [A representation of anything (as a person, a landscape, a building) upon canvas, paper, or other surface, by drawing, painting, printing, photography, etc.]