I apologise if this is already a discussion, but something a client spoke to us about (and to be honest we would like as well) is the ability to add attachments to comments in Review.
For example, a comment might be: "Change picture of man, for man with hat. We will provide."
They would then have to send us that image separately, not so bad if that is the only one, but if there are several of these occurrences it could get confusing. Being able to attach said image to that comment would fix this.