A Gravatar is a Globally Recognized Avatar. You upload an image and create your public profile just once, and then update your public profile photo on any gravatar supported service.
HubSpot could implement the free Gravatar API to update contact photos automatically where they have a gravatar set.
This seems like a no-brainer and simple implementation that would add a lot of value as it helps me to see my contact's faces when I'm in their record.
