Actually Project Manager does not show the gravatar or the profile pic that user has uploaded to their profile on their account. It will only show a profile pic if they have a gravatar pic. Not everyone uses Gravatar. By using the pic on the site whether it be the site profile pic or the ERP Profile pic it would be more cohesive instead of a everyone having a gravatar pic on backend and then a different profile pic on front end. You must admit two different pics is very annoying.