The askew gaslight for me makes the picture. Everything in this picture seems sort of askew. The size of the subjects head, the printing, the cropping, the mood all seems sort of Hitchcockian, slightly creepy and ......askew.
You just made me think - that could be taken to be a pretty good description of Bacon's work, also? To put it mildly, perhaps (I do very much admire Bacon's work - hard to use the word 'like').