Check this out... you can enlarge to the mm of the image. See every stroke, mark and blend. Pretty amazing. Start with the article linked and then use the link to go to the actual artwork page. Caution.. its a real time sink 😃
https://petapixel.com/2022/01/05/this-717-gigapixel-photo-is-the-highest-res-ever-captured-of-artwork/