Translation of "pitter" into English

Ikkunsidra dan: Il-fatt li l-istorjografi taʼ l-arti kienu jafu li Leonardo da Vinci pitter il-“Mona Lisa” ma waqqafhomx milli jinvestigaw x’teknika u x’materjal uża.

Consider this: Knowing that Leonardo da Vinci painted the “Mona Lisa” has not stopped art historians from investigating his technique and the materials he used.