A short brief gives a small creative project a place to begin. It can describe the intended reader, the purpose of the work and the practical limits without becoming a complicated document. Clarity matters more than an impressive vocabulary.
Start with a sentence explaining what the piece should help someone understand or do. Follow with the material available and the format in which the work will appear. Include a clear note about what is still undecided.
Add a small set of questions for review. These might concern readability, tone or the balance between an image and its caption. Specific questions make discussion easier than a general request for opinions about the whole design.
Revisit the brief before calling the project finished. If the work has changed direction, explain the decision rather than quietly ignoring the original purpose. A useful brief remains a shared point of reference throughout the process, even when its first version needs revision.