This is a service-marketplace topic, distinct from product-listing reviews
Managing reviews on a freelance service marketplace like Fiverr or Upwork is a different challenge from managing reviews on a product-selling marketplace -- there is no physical item to photograph, and the relationship is built around delivering a service and setting expectations along the way, rather than shipping and packaging. If you are selling physical products instead, the considerations (photo reviews, shipping-related complaints, and so on) are different.
How the review system works varies by platform
Different freelance platforms weight and display reviews differently, and some emphasize a request-based model while others center on browsable service listings. Comparing the platforms you are considering is worth doing before you decide where to build your reputation.
Frequently Asked Questions
Is it against the rules to ask a client to leave a review?
Politely asking for a review is generally fine and common practice, but offering money, a discount, or a gift in exchange for one is typically a violation of platform policy and should be avoided.
Can a malicious review be removed?
If a review is factually inaccurate or clearly unjust, you can usually request that customer support review it with supporting evidence attached. That said, a review generally will not be removed simply because the rating is low.