You were complaining about how the image being upside-down on the ground glass confuses you, and then you literally asked “How do you know when the best time to shoot (sic)?”
The point is that, at the time of exposure, you can’t see the image on the ground glass anyway. This applies in portraiture, landscapes, or whatever else you are pointing your view camera at. Turn the question around on yourself: How do you know “the best time to shoot” anything with a view camera? Now do you understand?
Ok now I understand your point. It would have been clearer if I said. "How do you know when you have the best composition looking upside down?"
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