You should upload a recent photo taken with a digital camera or scanned from a good quality printed image and required to have a scanned (digital) signature as per the specifications.

Photo dimensions are 300 X 300 pixels (Width X Height). The file size is less than 100 kbytes.
With modern digital cameras, or even phones with built-in cameras, it is easy to create a very large file. But large images files can take a long time to upload and use a lot of storage space, so we have limited the upload size to 100Kbyte. If your image is too big you can easily make it smaller with an image editor.

Make sure that the picture is in colour. Black & White, Monochrome, Grayscale, Face too Close or too distance, Blurred, Too light or dark, Obscured, Uncropped or any image other than photo will not be accepted.

Looking straight at the camera with a relaxed face.

If you have to use flash, ensure there's no "red-eye".