Honestly its really sad that some clients don't review sellers work,specially since we make custom designs for them ,based on their requirements, I have been telling clients while delivering"your review is of high value to me and other future clients" but since mentioning about review is violation of T &S (which I didn't know) I wouldn't be asking from now.
I wish fivver does some changes,its really motivating to get reviews for your work,and getting ignored after accepting delivery kind of feels rude.
Anyways its just what I feel as a seller.