The product image is cropped or blurry
WooThumbs uses the
Single Product Image size from your WooCommerce settings. This can be accessed at
WooCommerce > Settings > Products > Display > Product Images. Some themes disable these options, so you'll need to contact them in order to gain access.
Here you can set a width, height, and whether to crop the image.
Usually, it’s best to set the width relative to your theme’s display area, and then set the height to something like “9999” with
Hard Crop? unchecked.
Once you change your setting, you will need to regenerate your thumbnails.
If you are using WooThumbs, you will also need to clear your image cache. Go to WooCommerce > WooThumbs and click Clear Image Cache.