Google had changed their policy so the old way for getting the Google profile image will not work now, which was
https://plus.google.com/s2/photos/profile/(user_id)?sz=150
New Way for doing this is
Request URL
https://www.googleapis.com/plus/v1/people/115950284...320?fields=image&key={YOUR_API_KEY}
That will give the Google profile image url in json format as given below
Response :
{
"image":
{
"url": "https://lh3.googleusercontent.com/-OkM...AANA/ltpH4BFZ2as/photo.jpg?sz=50"
}
}
More parameters can be found to send with URL which you may need from here
For more detail you can also check the given question where I have answered for same type of problem
How to get user image through user id in Google plus?