If the photos you see in the Client Center look a little blurry, don't worry! The photos look that way to take up less space and less time to load in the Client Center. If you're uploading large photos, chances are they look just fine on the site even if they're a little blurry in the Client Center.
However, if you are on your landing page and you notice that the photos are still a little blurry, that means your photos are not large enough. You can delete the photos in your Client Center and upload larger photos there too to replace any blurry images.