This is fan art of high quality, attempting to make a high detail version of the same art and design from the show with familiar characters at a familiar location. Not surprisingly, this is clearly done by a devoted fan, who clearly sought to make the scene similar to the time when the location was seen in the TV show. One of the assassins is purposely left dead face down, much alike how she was dead in the show and her mask removed by jack... and jack is also shown heavily wounded and in rags, the state he was at this point. While this isn't an actual scene from the show, you could mistake it as such. That is how uniquely well done this is.