The right lighting can either make or break your shot. The perfect amount of lighting can highlight intricacies, while too much or too little light will highlight flaws. As a photographer, it is your job to create a set-up that best suits your perfume bottle. If the bottle is simply round, you'll have a much easier time photographing it. If the design is complex, you'll be dealing with a lot of shadows and reflections. Every bottle is unique, so it is your job is to use lighting to your advantage to rid the pesky reflections. Be sure to avoid using the camera on your flash, you want the picture to have a natural light to it. As for exposure, I suggest using an aperture of f/8 since it's the perfect amount of lighting.