(Didn't mean to criticise your shot, Adey - indeed, I think it is an excellent example as a basis for discussion.)
Yelvertoft brings to mind another point: I have a shot I really like of a land/seascape (an estuary actually) and it's out of true, quite noticably so. My usual graphics editor allows me to rotate to correct that, and crop to suit, but - and here is my point - I can rotate by any given number of degrees, and 3 degrees is too much but 2 degrees isn't enough. Drives me nuts!
Excuse me: here is my point: at least with some pictures, the orientation has to be exactly right, and it is very surprising how small a difference the eye picks up on.
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