A logo / typographic prompt — a clean brand starting point.
Prompt
Title (large text): Fast-Acting Happiness Capsule
A capsule pill with a green top in Starbucks green and a transparent bottom, printed with the Starbucks logo. Inside the capsule are numerous coffee beans.
Description (small text): Take when feeling sad or down. Three times a day, two capsules per dose.
Buy button: Same color as the capsule.
Below the button, display the price: $9.
Please follow medical advice and purchase as needed.
The prompt is mostly a plain-language scene description. That makes it a flexible base: add a focal length, a light direction and an aspect ratio and it will land the same way on every run.