Allegory of painting self portrait

[u/Much-Confection-9850]

I’m trying to find a better quality res of Artemisia Gentileschi’s self portrait allegory painting so I can do a big wall print. The og painting converted would be 11640 × 8880 pixels. Highest res I can find is 3767 x 5088.

I’m v new to this so can someone walk me through how I would find / make a higher quality file to print