The more precisely a task is defined, the easier it is to get a result that matches expectations.
First, it’s worth describing the purpose of the visual: where it will be used — on a website, in social media, in advertising, in a presentation, or another format.
What helps clarify the direction?
If the work involves a specific product or brand, it’s worth providing its photos, logo, brand colors, or other materials that help clarify the visual direction. It’s also useful to show style examples you like, if you already have a sense of what that is.
It’s just as important to describe the idea itself. Even a short description can be enough: what mood needs to come through, what should be the main subject, what colors or atmosphere are desired, and what you’d rather avoid.
What if there’s no idea yet?
If there’s no clear idea yet, that’s not a problem either. You can start with the task and information about the brand, and develop the concept from those materials.
In other words, you don’t need a ready-made brief to get started. What matters most is understanding what the result should achieve and what the visual will be used for. Sometimes it’s enough to simply share your idea — and from there, it can be turned into a visual concept.