+1 for more pics. Take them outside and from different angles, showing as much of the car as possible. Don't take them on retarded "artistic" angles...
Personally I would say $8000 to $9000 would be fair, although I've never seen the car in person. It really depends on how long you're willing to wait and whether theres a buyer near you who wants an R33.
The more places you advertise, the better your chances of selling. As I've said, try carsales.com, ebay, firesport.com etc. Don't bother with drive.com
Another +1 for detailing the car like a dealer, they can make a very average car look great. Tyre shine for the tyres, clean the rims with a strong cleaner, amoral all interior parts. A good trick to make the car look good is silicone spray. Air box, hoses, top of radiator, spark plug valley cover, fuse box etc in the engine bay, then the plastic tray underneath the windscreen wipers, plastic strips around all windows and so on. Spend a few hours cleaning it and you'll be surprised how good they can come up.