Actually, the overly dark scenario isn't wrong at all. According to a French envoy who met Pedro II in 1869:
"My meetings take place in a little study, the emperor before his desk, loaded with books, and I beside him, seated on a chair and leaning on the table; in front of us is a querosene lamp probably worth about 15 francs and which never works. His Majesty assembles and disassembles it with an admirable patience, every other minute, while continuing our conversation." "I took a chair beside him, slightly turned away, and we started to talk of everything and the rest. He was very cheerful and very alive, very informed, havind read everything, and having truly read it."
Source: page 136 of Barman, Roderick J. (1999). Citizen Emperor: Pedro II and the Making of Brazil, 18251891. Stanford, California: Stanford University Press.
According to Barman: "The bulk of each day was devoted to affairs of state, but Pedro II spent as much time as he could snatch away from the work reading books, newspapers, documents, and letters, his pencil at the ready. He filled the margins of whatever he was reading with comments and corrections, some of them profound and perceptive but just as often slight and superficial. He even corrected typographical errors he encountered. The emperor's formidable memory allowed him to retain and to make use of knowledge he picked up during his ciracious reading." (Barman 1999, pp.136137)
Barman: "The image of Pedro II sitting alone in his study immersed in reading and writing catches the essence of the man. Throughout the length of his reign, he never depended on a personal secretariat... Pedro II handled the entire business of governing unaided, drafting and making good copies of documents, keeping notes on the meetings he attended, corresponding in own hand with ministers and lesser officials." (Barman 1999, p.138)
Barman: "There was also the emperor's private study, similarly filled with books." (Barman 1999, p.136)
Here comes my remarks:
What the developers got right: the scenario, the mood, the darkness, the emperor alone working until late.
What the developers got wrong: there are no books. The man was all about reading. there should be more books and papers there. He also looks too serious. Pedro II was not the kind of man who joked or laughed. He usually spoke little and chose carefully his words. However, he was always kind and polite.
For anyone interested in knowing how Pedro II's study (the room he worked) actually looked alike: