According to a book written by a Mexican scholar whose name I can’t remember now, the stars on Mary’s cloak and some other details on the painting were added long after the original image was created.
In about 1960, the official Catholic story was that a reflection of Juan Diego was present in Mary’s eyes. I wish the images would be published.
I like to visit such artifacts and locations, it’s a great hobby. I’ve saw the tilma long ago, and recently St. Peter’s grave below the Basilica in Rome. The chains that held St. Peter are in Rome also. Chimayo in New Mexico is another good one to visit. I’ve got some dirt from Chimayo right here with me. The Shroud of Turin is the one I’d really like to see in person. And then there’s Lourdes and Medjugorje. Plenty of places left to visit.
It’s been examined scientifically. There is no paint on it.