How would the story be different if told from Narcissus's point of view

The crux of Narcissus character is his own self involvement, he rejects echo because he is more or less in love with himself. He would not care about Hera's punishment because he is to wrapped up in his own vanity. As far as he is concerned a flower holds no beauty to him. He would talk about himself and himself alone because he is too self absorbed to do otherwise. Narcissus is where the word Narcissist is derived from...

Narcissist  

Noun  

A person who has an excessive interest in or admiration of themselves

Explanation:

he would basically talk about himself

what is the question then i don’t see one

you make more money, you can get a better job, you have a better education, you are wanted more by most employers.