How did you miss such an important picture :/ when you knew you shall be applying for PR.
Well you have what you have, see if you have any close enough picture of nikah time, like one with Mulla sahab, or your wife crying or hugging or along that moment of time and submit those, It's not always black or white, you have a document which proves you are married, don't worry about it too much, people have submitted everything yet they are waiting for years, so don't bother yourself.
In sha Allah it shall work out
Regards.