Write a brief that leaves room
A good brief says what you want and what's still open, so the right people can answer.
Start with the result
Say what you're making, who it's for and the feeling you want. Add a few references with a line on what each one is for.
Separate what's fixed from what's flexible. A date might move; a budget might depend on usage. Saying so invites better questions.
List the practical bits
Deliverables, people needed, location, time window, where the photos will be used, and anything about access or safety. Then leave room for the creative to suggest a better way.
A brief doesn't book anyone or set the price. That happens when you both accept an agreement.
Choose a few, not everyone
A short, thoughtful list beats sending the same vague request to twenty people. Send your request from the portfolio that fits, and let them ask questions or say no.