The Norton Simon Museum is known around the world as one of the most remarkable private art collections ever assembled. Over a thirty-year period industrialist Norton Simon (1907-1993) amassed an astonishing collection of European art from the Renaissance to the 20th century and a stellar collection of South and Southeast Asian art spanning 2,000 years.
When cimparing to a photograph it might be worth considering whether Panini is using normal perspective rules. I think he has his own method that most cameras would not be able to emulate.
Looks like the Art Institute of Chicago needs to give equal restoration treatment to the Norton Simons' Rag Collector to bring out more depth of color.