The left hand and the right hand are 'mirror images' (of each other). = The left hand is the/a 'mirror image' of the right hand.
He's the 'mirror image' [=(more commonly) 'spitting image'] of his father. [=he looks just like his father]
She is worried about what motherhood will do to her 'image' [='reputation'] as a rock star.
(..) - Oh but she'll keep her word Have you heard the argument? ls there no offence in it? No offence in the world. This play is the image of a murder done in Vienna Gonzago is the duke's name, his wife Baptista You shall see anon, 'tis a knavish piece of work. But what of that? (..)2015 Hamlet
(..) For anything so overdone is from the purpose of playing... ...whose end, both at the first and now, was and is to hold the mirror up to nature To show virtue her earn feature, seem her own image And the very age and body of the time his form and pressure Oh, there be players that I have seen play, (..)2015 Hamlet