Vincent van Gogh was not working from some dark artistic creative license and painting Mary Kelly's mutilated face and body in his Irises from the photo.
Van Gogh painted Mary Kelly as he saw her after he murdered her. I believe he made a sketch of her while he was still in her room, and that he then painted her later in his Irises painting working from the sketch.
Vincent van Gogh was Jack the Ripper.
See the overwhelming and powerful evidence in VINCENT ALIAS JACK.