Whats causing image quality to be degraded?

Some of your images are png: http://www.shoplikeits1999.com/wp-content/uploads/2015/02/Harvest_Moon_64_Coverart.png

And that image not 460px by 300px and is being stretched to fit the grid.

I would guess that you need to be more careful in which images you upload and how you process the images prior to uploading.

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