The difference between the resolution of the large and medium large image is considerable. If a large image is provided (1820*1820), then the resolution of the main image in the media gallery could easily be higher. Right now, there is a limit of how big the main product image becomes (even if given 12 spaces). It should be possible to configure a different resolution for the medium large image. And it should be possible to resize the image to a size that is larger than the current limit.