Hello Richard, thanks for reading. True, I don't go too deep into provenance, but the sources are cited at the end of the article. The Burlington Magazine is where both identifications were published (Farr on O'Neill, Fenlon on Murray). The signature on the O'Neill claims he is "King's Painter," Pictor Regius. He had painted the king, but held no such appointment, and this is a claim Wright makes about himself on other signed paintings. Plenty of surviving handwriting samples for Farr to work from. I know of no signature being located on the Kelvingrove painting of Mungo Murray, which it the one I focused on, though it seems to have been cleaned? Wright is pretty well studied--do look into the Burlington articles if interested. My bit was a focus on the clothing as something more than fancy dress. Cheers.