If applying for a Renewal pass you will be able to upload a new passport-style photo if you wish, but this will be mandatory if you were under 18 when your previous pass was issued. Upload of proof of residence and/or disability documentation may still be required, even for Renewals, and so you must be able to do this if requested.
Note to Renew online today the expiry date of your existing pass must be no later than 24/03/2020.
With all applications you must be able to supply an email address for communication re acceptance of, or problems with, your submitted application. You will also need to enter a password to enable you later to Log In (if requested) to supply an alternative photo, for example, or different documentation proving eligibility.