If anyone is still using stock photos on their websites, I would recommend you stop right now.  Get out there and take your own pictures; better yet, take them in front of your store to build instant credibility.  Also, make sure you have a good camera; a good one should be able to support 100 photos per car.  An easy way to take these pictures is to set up three spots; one for small, medium and large cars.  Then put dots around each spot.  So anyone can take these pictures just by walking around the car taking a picture from every dot.  One thing that is very important when taking pictures of your vehicles - is consistency.  To go even further on this, you could use high definition photos; they will increase conversions.  With high definition photos, the customer can now see every little detail on every picture.  So instead of calling you, which is great, they can zoom in and see if the car has an MP3 jack, or if it has Goodyear or Pirelli tires.  Just make sure you have a good cleanup crew, because now every little blemish left behind will show.  Using high definition photos builds instant trust in your dealership - because they know you have nothing to hide.