Are you talking about the Matching Question slide, I suppose so.
Which version of 6, please?
Anyway, none of the three versions of 6 has yet the system variable cpInReviewMode. You'll have to create your own user variable, will label it 'v_review' to track that. You don't tell if you allow multiple attempts on Quiz level? The idea is that this user var has an initial value of 0 and will be toggled to 1 when the last Quiz attempt is done. This is possible by creating a conditional advanced action, triggered on entering the Score slide, something like:
IF cpQuizInfoAttempts is equal to n (n being number of Quiz Attempts)
Assign v_review with 1
Continue
ELSE
Continue
Create your image (or text container) on the question slide, that you want to show up during Review and make it hidden in the Properties panel. Beware: the objects on a question slide are always on top of the stack, put that image where it is not beneath a quiz object. And for the On Enter action of that slide create another conditional advanced action:
IF v_review is equal to 1
Show image
Continue
ELSE
Continue
Lilybiri