You can set a profile picture on your Gmail account, by navigating into the Settings section and then go to the My picture tab and upload image. If you are not able to change the profile picture on Gmail, then you should confirm there is an active internet as well as you select the correct image to upload. If you still can’t do it, then speak to a live person at Google about it to fix. https://www.onlinedigihub.com/social-media/gmail-customer-service