Ok...
Headlights: IF you look carefully, you'll notice that there is light coming from the headlamps at a distance but when it gets close, it goes away. I guess a bug in GT3.
Video: Nissan, if you want the best critique you can get, put the gears in the vid as well. It's helpfull to understand whats going on with the car.
Drifting: Well, progess without a doubt and you're getting smoother. Try increasing your angle a bit. It seems that your countersteer is currently "suffucient" cause you're angles aren't too high. The higher the angle, the more precise your countersteer must be.
Keep on drifting!