In addition to the technical quality of your photos, you also have a visual quality. This means quite simply whether the photo was taken with a good camera and if photo was photographed sharply. You can check this by zooming in on the original photo (not in the IXXI editor, but on your own computer or phone). When you enlarge the photo, you suddenly see all the small imperfections in the photo very clearly. The visual quality is not measurable, so the module does not report when the visual quality is insufficient.
What to do with low image quality?
You can try to improve the quality of your photo with an online program, such as pixlr.com. Or try another photo with a higher resolution. If necessary, a professional photographer can adjust your photo. Of course you can also choose to use this image anyway.
*How Pixlr works: Open your image. Choose 'Properties' in the menu at the left. Then choose 'Resize image'. In the pop-up screen you increase the number of pixels. You will see a preview of the quality and then you can save your file. When saving, choose 'jpg' with the highest quality.