Find a location that enhances the look of your car and does not distract. You are selling your car and not the background. Take pictures outside instead of indoors for natural lighting. Wait for the right lighting outside. Choose the time of day when daylight is optimum. Avoid shadows that can alter the actual color of the car and hide imperfections or details that increase your cars value.
Make sure to wash your car and vacuum or clean any interior clutter that can distract or reduce the value of your pictures. Buyers associate a clean car with a well maintained car.
front, back, sides, underneath, wheels, engine compartment, trunk, interior - especially driver seat wear, identify areas of concern like dents, scratches, or imperfections that may concern a potential buyer. Include pictures or scans of service records, or after market performance modifications.
Provide close ups so you fill the picture primarily with the car. Avoid including too much background that makes the car too small and difficult to accurately see.