The BBC1 show "The One Show" had a few minutes about how to take the perfect wildlife photo.
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"Try to focus on the species’ most striking feature e.g. its jewelled wings or bright spots"
Hmmm, i reckon focusing on the eye ....
not always.
Depends what you are trying to achieve.
Taking a 'rule of thumb' and applying it to everything all the time is not a good way at all. We'll all be wearing uniforms next.