Glass is the hardest product to photograph and one of the easiest to prompt, because with glass almost everything visible is the lighting. Name the surface and the light direction and the bottle largely renders itself.

What the prompt fixes#

This is a deliberately short prompt, and every clause in it is a lighting decision. Controlled specular highlights shapes the edge reflections that give glass its form; the atmosphere clause adds the one element separating a product shot from an advertising one.

There is no lens, no focal length and no composition instruction. With a single object on a plain surface, adding them narrows the result without improving it.

The negative prompt carries the practical concerns of real packshot work: fingerprints, dust, visible logos.

Changing it#

{{product}} and {{surface}} set the reflection relationship, and the contrast between them is what you are really choosing — frosted glass on black marble reads very differently from clear glass on white stone.

{{light}} is the most consequential variable. Single dramatic side light gives the luxury look; a soft top light gives something closer to e-commerce. {{atmosphere}} is optional in practice — strip it for a cleaner, more catalogue-like result.