Shopee official requirements for cover images
Image must be clear, sharp, not pixelated and photographed professionally
Images should be professionally taken and have high resolution (not pixelated or blurred)
Shopee official website original details:
Cover image criteria — image quality
Image must be clear, sharp, not pixelated and photographed professionally
Images should be professionally taken and have high resolution (not pixelated or blurred)
Article source: Shopee official website