I saw peoples here amazed by details in games like GT5 or Forza3-4 like the headlight. Well here to show you it's really nothing to be amazed :P

On the left is the basic 3D shape and basic texture to make it look like chrome and glass. In the middle is the part who make it look so amazing. Put that in the glass texture as a bump map, add some light and gloss and voilà a perfect headlight :P

I did it in a matter of minutes once I made a try.