I'll answer the first part, with the link to photo requirements from my PPR:
https://www.canada.ca/content/dam/i...ormation/applications/guides/pdf/5445eb-e.pdf
Summary: 2 photos, taken by a commercial photographer, 5x7 cm, face/shoulders centred in the photo, height of face between 3.1 and 3.5 cm, white background, taken within the last six months. The date and contact details of the photographer need to be written on the back of one photo.
My advice would be to use a ruler to verify all the dimensions. The photographer I used first really messed up on the centering and height (way too much whitespace on top) - so I sat down with them to make sure they did acceptable ones.