We advise that all images in your artwork should be 300dpi, or 150dpi for banners and boards. Check the Artwork Guide on the product page to confirm the artwork resolution for specific products.
If your images are lower than this, they may have been taken with a digital camera set on too low a resolution or sourced from a website. Images for the web are generally 72/96dpi which is well below the 300dpi we recommend for print. This is why an image may look fine on your screen, but appears blurry when printed.
Please ensure that you source high resolution images, either from an online image stock library or using a digital camera set to a high resolution.