What emotion is this facial expression trying to convey?
In fact I believe that one day a reappraiser will come and declare that, far from having been a frivolous firebird, I was a rigid moralist: kicking sin, cuffing stupidity, ridiculing the vulgar and cruel—and assigning sovereign power to tenderness, talent and pride.
It's that I know you know or think you know me look but without my affirmation, which I would obviously never, never, never give you you don't know shit and I have power over you for wanting to know something which you simply can not. This face, I believe, conveys the disposition of smugness and it implies the person he's looking at is being made a bitch of. More than implied really, it is felt.
It requires knowledge of a previous Nabokov expression to "get'
His facial muscles indicate largely happiness and sizable but minor amount contempt, with a tiny bit of anger. Downward head tilt + eyes cast upward suggest submissive yet defiant state (tho that might have just been a result of the angle of the camera).
Read some studies on facial expressions; they're not actually that complicated.