:The source for that image claims that it was computed exactly, and I see no reason to doubt that; it looks correct. The image you linked, on the other hand, looks like an artist's impression by an artist who doesn't know much about black holes. The fact that such images are common in popular science magazines doesn't mean we need one on Wikipedia. But you're right, the image does look really bad. Maybe what it needs is some touching up in Photoshop, to make it look less obviously computer generated. At the very least it could use some CCD noise in the center disc.