Take a wide view and a detail
From a safe ground-level position, photograph the full elevation and the area of concern. Include a window or doorway for scale without putting yourself near loose masonry.
Describe the change
Say when you noticed it, whether the crack or damage appears to be growing, and whether the area has been repaired before. If you do not know, leave that explicit.
Explain the access
Mention a narrow side yard, nearby steps, a shared boundary, plants or other access constraints. Photos do not establish the final access or safety requirements.
Keep the scope honest
Matching old brick can have limits. Ask about compatible materials, the repair boundary and any further investigation needed before judging the work only by colour.
Your first brief can be simple.
The location, the main change you want to make, a rough sense of scale and a few photos. You do not need to have every decision made.
Put your brief together