Google Plus allows you to modify almost each and every aspect of your profile. From adding special effects to your uploaded photos to enhancing your profile privacy, Google+ allows you to perform all these important tasks. In this tutorial we will learn how to modify your profile picture on Google plus.
First Log into your Google Plus account – From the top menu click Profile icon
On your profile page – click Edit Profile – Then click Change Photo Link that appears below your default profile picture.
Here you can easily Browse and upload the photo you want to make as your default Profile Picture. After uploading you will also get an option to crop your image before you using it as profile photo.
Further Reference: How to Create Private Albums in Google Plus