There's no such field mentioned in the documentation that could tell you if its a profile picture or not.
But one thing you can do-
Make the call- /me/picture?redirect=0
. This will return you a url
. (example)
Now, in your code you can simply check if this url
contains photoId
(a substring), if yes- its a profile picture.
Or, you can fetch the photo id of the profile pic before hand from /me/picture?redirect=0
and then check if the photoId
equals this- its a profile picture. (depends how you want to implement)
(This is a full-proof method yet I'm not sure its the best way to do so)