A picture of a black hole would be always artificial, for color don't really exist as it's only the brain interpretation of a part of the EM spectrum heavily av

A picture of a black hole would be always artificial, for color don't really exist as it's only the brain interpretation of a part of the EM spectrum heavily averaged, that's why we don't see green stars even if there are many stars whose strongest light is green, like our own sun. Taking a real picture of a black hole like with a cellphone camera would likely be just like a bright white star.