Before you start
Wide shots of the whole room or area. Close ups of existing damage. Anything valuable or fragile nearby. Access routes and floor coverings. Meter readings or existing installations where relevant.
During the work
Anything that will be hidden afterwards, anything that turned out differently to expected, and anything the customer asked you to change once work had started.
When you finish
Repeat the wide shots from the same angles as your before photos, then close ups of the finished work and the area left clean and tidy.