This is a very good question you asked my dear friend.
Displaying of your smile & real photo makes a lot of confidence on your affiliates, who will join under you.
1. They will realize that his/her sponsor is a real.
2. Smiling photo makes an impression on their mind that the sponsor is very kindred person.
3. Normally CSAs may not know the co-sponsor and if they will find a smiling photo in their first sight, they will get a good impression and also will get a positive energy to work hard with the newly appointed co-sponsor.
4. The PSAs joining through advertisement will find that the sponsor is a professional if the photo is real and smiling.
5. The real photo will makes a lot of differences in the online business as the affiliates will keep in touch with the sponsor only online.