Updated
A fragrance is sold on a feeling, but online the bottle has to carry it alone. The photo must show the glass, the colour of the juice and the cap clearly, then set a mood that hints at the scent: fresh, woody, floral or warm.
Perfume bottles are designed to catch light, which is exactly what makes them hard to photograph. Faceted glass doubles every reflection, and a clear bottle shows whatever stands behind it. Each bottle in a range has to be lit so it looks like the same family.