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So you set the camera up for them. Do you remember advising them as to how to correctly maintain your position in the frame? It's easy for a non-photographer to screw up the composition unless you prepare to crop aggressively if need be.

I did give instructions, but I still had to crop out a bit on the right hand side because they were too far to the right, which is why the photo is almost square.

I always select a tourist with a nice camera hanging around their neck :) . I know it doesn't mean that much but at least it shows they might have some experience.