The products I created from an image I uploaded on December 1st are looking very blurry. I only saw that issue 3 days later when I created a product that have a high zoom view (a tie).
I reuploaded the same image (without any change) and made a replacement on my products and the blurry issue disappeared.
There must be an upload issue on Zazzle that lower the quality of images in some cases. Please Zazzle, could you have a look on this issue; it could lead to send blurry products to the customers.