I saw a tradesperson’s van announcing that:
WE ARE PROFESSIONAL KOREAN PAINTERS
I wouldn’t have thought that there was much money to be made from painting Koreans. Perhaps they should try painting houses instead. Ha ha. I wonder if any non-Koreans hire these painters because they are Korean, or because they are professional and experienced.
In 2015, during my second stay in Korea, my wife and I went to Dongdaemun Design Plaza. A number of young artists were painting caricature portraits of people. We got ours done. It was (and is, as I look at it now) very apparent that the artist was much more experienced in painting Koreans than foreigners. I’m recognisable, but that’s about all. (Looking at it again, I can see that’s it actually pastel.)
When I taught English, I had a set of flashcards of occupations (and still have them). Two were/are of a painter, which showed someone painting a house, and an artist, which showed someone painting a painting (which, when completed, really should be called a painted).
(Korean painters might also be these people.)