Great post!
I have some experience with this. Some of my gig pictures were not well optimized for the Fiverr mobile app, and I hadn't closely examined them. However, upon closer inspection, I realized that certain areas of my gig images were being cropped, and some text was visually disappearing in the mobile app.
To address this, I re-edited some of my gig images, ensuring that they highlighted my gig's main objects properly. Interestingly, after changing the gig image, I received a new order after just three days. This was surprising, especially since that particular gig hadn't sold anything in the past.