how to change your Google profile image.
Applications for Education
Changing your Google Apps profile image can help with name recognition so that parents begin to put a face with a name as soon as they start receiving emails from you. They won't have to wait until the first parent-teacher conference or open house night to make the association between your face and name.
If you have more than one teacher in your district with the same name or similar name (at one point there were three Mr. Burns and a Mr. Byrne in my district) students seeing an email with your profile picture can visually confirm that they are emailing the correct person.
Learn lots of tips like this one and get in-depth Google Apps training in my online course Getting Going With GAFE.