Consumers want to do shopping in stores which are safe and already verified by other consumers. They also want to have proofs that what they purchase is what they expect. If you enable the option of adding comments about products along with pictures, you will make your offer and your shop more credible for other consumers. Moreover, you will create a king of community around your brand.
Customers who visit your shop for the fist time are more likely to place an order because they can see that others have already put their trust in your brand. Social trust is extremely important. It is the best way to show that you are trustworthy and can be relied on.