If you think it looks semi blurry or you are absolutely positive that it is blurry, your best bet is to upload a different photo. If it looks blurry on your end, it will look blurry when printed.If you had cropped the photo significantly to zoom in on just one person, try to recrop and add more of the image back onto the front cover. However, please feel free to give us a call and we can view the image in our system and give you advice on proceeding.