I have my headshot photo set up through my email address carrier and all my WA site mail is forwarded there, so that if I reply to site mail it includes the photo.

This is different than setting up a Gravitar image for answering comments.

I think the picture should come up if the linked gmail has the picture.

Generally, for questions. go to the magnifying glass at the top of the page and type in keys words. Relevant trainings and post will come up.