I forwarded to the French WLM list and our photograph workrgroup list, asking for input. People made several points :

*Although anyone is free to use the software he wishes, FLOSS or not FLOSS, and we have no intent to discrimate people who use unfree software, actually offering unfree software as prizes is at odds with what we are trying to promote with this free photograph contest. It may also gain us bad fame with die-hard free activists.

*it is very already very late in the contest (2011-09-19), so adding some prizes will not help us having more photos.

*in France at least, as a contest need to be declared, with bylaws and everything, it is not sure we could add prizes if we wanted.

--
Jean-Frédéric