Can the ability to give good critique be learned, and if so, where would one begin?
Of course it can. People aren't born with the ability to do it
However...
First you need to become a good photographer. That is, know yourself, why you do what you do, what you try to do with
your photographs - your motivation. You can't tell others what to do or where they have gone wrong unless you can apply it to yourself.
Then you need to have more than one such person give
you some good critiques to see how it's done. And you need to realise that a crit, being personal, has to be tailored to the individual and learn the techniques - tailoring the level of your crit to the level of the person.
Finally you learn that what you are doing is finding out what the person you are critting is all about and then gently nudging them in the direction that they want to go in. It's a bit Zen really.
Not essential - but certainly a big help - is to have some of the top photographers of your day treat you as a peer and seek your advice because they respect you. This lets you know you are not talking b*ll*cks :mrgreen:
A crit is a bit like a car: they range from the Reliant Robin to a Rolls Royce.
Until you have a Rolls you don't know what you are missing (so you won't miss it - but don't worry).