Kathy, in this particular case it's the top cropping that bothers me more than missing the nun's object of attention, although that is a bit bothersome also.
Cropping is really just a composition tool, and composition isn't easy to reduce to a set of rules although these exist out there (rule of thirds etc.). The most important considerations I've found are:
- Don't allow edge features to draw attention too much, particularly at the corners.
- If you have diagonal lines it's best if the lead toward the center and/or primary subject. Also best if they lead (outwardly) toward vicinity of the corners although this is often not possible.
- It's best to be aware of compositional issues when you frame the shot. I usually frame in the camera and rarely crop, but you should at least be aware of the issues at capture time.
The issue I have with your image is the first point. The corbel (in particular) and "incomplete" door draw too much attention to the top, and don't lead back. In this case I would either include more, or crop down further - the exact point is debatable but cropping down near to the bottom of the corbel or even deeper to about the top of the larger diamond pattern on the door would be superior to what you have now. Another crop that works for me is to turn it into a portrait by cropping the left off almost all the way through the bench (leaving the top alone). This approach also lessens the impact of the subjects attention being out of the frame (by moving the subject closer to the center).
If I had been there at the time (always easy to second guess), I might have stepped a few steps to the right. This would have done several things: better (side) profile on the subject, shifted the door from being the direct background to the subject, introduced more perspective and depth to the bg wall.
AFA learning this, it's a gestalt thing. I'd suggest taking a few images that need help, dup a half dozen of each and crop each differently, then lay them all out in PS for comparision. The better ones should grab you - it sometimes helps to squint or turn them upside down
so that the compositional issues are separated from the content.
- DL