As his past puts him back in Brussels...
This one threw half of you, but the other half who sent in the correct answer numbered many more than the five prizes available anyway... does that make any sense?
The information you needed (to be in with any chance at all) could be found in this news item: 10.07.2003 NEWS: EUROPEAN LEG OF REALITY TOUR KICKS OFF TONIGHT
From that piece, the five BowieNetters listed below (in alphabetical doo dah) gleaned the following relevant information about the picture in the print above: The shot was taken on Saturday, October 4th 2003 in Brussels, Belgium, during the final dress rehearsal for A Reality Tour.
Here are the five BNetters that said something along those lines and that TRG? very randomly generated:
If you're one of the above, please send me your real name and address and you will receive your fully signed print shortly. Please signify if you don't want my scribble on the thing. I will understand if you don't, as my signature is likely to devalue your otherwise most valuable prize!