I really doubt posting a picture will be a compelling reason to change Emperor’s mind; but of course, I don't have any doubt that a lot of people (me included) are looking forward to 幽忧's photo
I think his primary concern is the confidentiality of his identity which he's stated clearly a few times in the past couple of days.
Personally I don't seem to feel such a BIG concern because I believe we're doing here is something grand and sincere; but of course I can't speak on anyone else's behalf...
Everyone agrees that it would be a tremendous loss if Mr Emperor decided to leave us. The best we can do at this point of time are: (1) addressing his concern and expressing our understanding, (2) assuring him that there would be no (or invisible) impact to his business, (3) showing him how much anticipation for him is expressed here in the last 2 days, and (4) persuading him to rejoin this forum.
I think the best person in the best and the most convenient position to do this is Chairman Wolf.
Let's keep our fingers crossed, and be a little patient...