Hi Scoop, I was there again this year (my 8th) Great pictures, very hard to find good places to take pics from at Circuit de Sarthe.
I didnt take much of the cars this year as I also went to the Spa 6 hours and there are places at spa where your sat ontop of the cars as there going around. I tend to take more pics of the fans and the experance. Also I had access to the Grid Walk passes through a rather well off friend so I had access to the Pit's when they are closed to the General Public
Your night shots are great, for me night shots of the 24 hrs are the most impressive.
The outstanding shot for me is the dirty 95 Aston Martin.
In will be honest though, not a fan of the boarders around the images, just personal taste though