It's a very good idea, you should work on it. Although the face model should be quite detailed or the user will see their "uncanny valley" self. I would use suc

It's a very good idea, you should work on it. Although the face model should be quite detailed or the user will see their "uncanny valley" self. I would use such an app. It has a high viral potential: people could share on social media fatter/thinner faces of themselves or famous people they like.