I have always been told that one should take the timegrapher pictures with a grain of salting as is said. If the watch is not fully wound up or the angle is wrong for the movement then it will not show accuracy.
Here is a handy chart I have used in the past:
1. Rate - How fast/slow the watch runs in seconds per day.
COSC certified, between -4 and +6 seconds per day
Excellent - +/- 7 s/d
Acceptable - +/- 20 s/d
2. Amplitude - the amount of rotation in the swing of the balance wheel
great : 270-310
acceptable : 250-270
3. Beat Error - how equal each swing of the balance wheel oscillation is.
Excellent : 0.0 - 0.5 milliseconds
Acceptable : 0.6 - 1 milliseconds