This one doesn't really work for me. Feels like there is only the one light source and no fill flash. I may be mistaken of course especially if this was very subtly done. Nonetheless, the balance of the shot doesn't feel right compositionally to me. Maybe if the converging lines met at an intersection of thirds rather than centrally the balance would feel better.
this is a beautiful shot. if i were able to vote i might deduct for the single light source. as i understand it fill flash is basically a secondary light source adding additional light to assist the primary light source.