Blurry Thumbnails

Hello,
Using the Mystile theme with woocommerce plugin.

I can’t get the thumbnail or product images clear. I know all the default sizes for the themes and I create an image of the same size in Illustrator and when it goes online it’s blurry.

I have tried everything on the woocommerce site step by step but no luck including creating larger images and regenerating the thumbnails.

I’m lost and hoping someone else knows a fix.

Thanks,
Kirk