You can choose a photo to set as your Gmail profile picture. This image shows up when someone sees your name in their email inbox or chat list.

Your Gmail profile picture is the same as your Google Account picture. 


Change your picture

  1. On your computer, open Gmail.
  2. In the top right, tap your profile picture.
  3. Tap Manage your Google Account.
  4. On your Google Account page, tap "Personal info."
  5. Under "Profile," tap your current profile picture.
  6. Follow the on-screen prompts to choose or take a photo.
  7. Tap Set Profile Photo.


for more info please see the following link:  https://support.google.com/mail/answer/35529?hl=en&ref_topic=3394219