But a black hole has literally never been imaged.
leading to:
how about the event horizon then
Currently, there is a project underway (http://eventhorizontelescope.org/) coordinating the efforts of many different researchers with the goal of resolving the event horizon of a black hole. This project would only produce an image that most people would still call extremely blurry. But it would be the first legitimate image of the characteristic visual features of a black hole.