shopee官方对于封面图的要求

• 图像必须清晰，锐利，没有像素化并且不能专业摄影

• 图像应专业拍摄并具有高分辨率（不像素化或模糊）

shopee官网原文详情：   

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)

文章来源：shopee官方网站