From what I can tell, Google provides two methods to get a profile picture.
The first is through the Profiles API: https://developers.google.com/google-apps/profiles/#retrieving_photo
The second is through the Google+ API: https://developers.google.com/+/api/latest/people#image
My question is: What is the difference between these two methods? Are they simply different APIs, or could the two reply with different photos and/or in different circumstances (e.g. depending on your permissions)?