After checking the image sizes for my store and other stores that have recently uploaded images, it looks that they have suddenly started compressing marketplace images even more than before. Now they are compressing full size images down to 20 - 40 kb and it's creating blurryness/grain/artifacts. Previously most images were compressed down to about 200 - 250 kb, which looked much more acceptable and didn't cause such a big loss in details that we are seeing now. I'm afraid they are probaby not going to fix this now since it seems they probably did it to save data. If they are trying to make pages load faster, I think they should have just compressed the small thumbnail images, and leave the enlarged product images alone. Because when people click on a product image to enlarge it they want to see the details.