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To upload a photo, first select a photo (a .jpg or .png file), then click 'Update Details'.
Photos being uploaded should be less than 500kb if possible to minimise the time required for users to download and view them.
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Ideally, ID photos should meet the 'Passport photo requirements', as follows;
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directed on the guidelines page for obtaining a passport; https://www.passports.gov.au/getting-passport-how-it-works/photo-guidelines
Guidelines for passport photos are;
Good quality, colour gloss prints, less than six months old
Clear, focused image with no marks or 'red eye'
Plain white or light grey background that contrasts with your face
Uniform lighting (no shadows or reflections) with appropriate brightness and contrast to show natural skin tone
Face looking directly at the camera and not tilted in any direction
Hair off the face so that the edges of the face are visible
Eyes open, mouth closed
Neutral expression (not smiling, laughing or frowning), which is the easiest way for border systems to match you to your image.
Source: https://www.passports.gov.au/web/requirements/photos.aspxgetting-passport-how-it-works/photo-guidelines