I sent the photo page for the initial spot in the application where it asks for it, and then under location I sent scans of the entire passport including blank pages because that shows immigration that you haven't left the country you applied in. They can see your last stamp was your arrival stamp in that country.
oh, for that you need a very clear image with all sides of the passport visible, so the best thing to do is to scan it because when you take a photograph there can be shadows obscuring the information.
Take a passport photo at a professional photography studio and use that in your application. That's what I did and it was accepted on the first submission.