I don't think Arte is Artemisia.
Artemisia's mother died when she was 12 while her father lived until she had a successful career, got married and had a daughter. Also, Arte came from a noble family while Artemisia's father is a craftsman/painter.
And if you read Artemisia's history, their path in becoming a painter is also differrent.
This story may inspired by Artemisia.. but I don't thing the author will fully use her life to depict Arte. Think of it like a parallel world where Arte lives instead of Artemisia.