I'm surprised that not releasing it was even on the table.
Releasing it does not constitute parading it around and gloating. It's confirmation for anyone in the world who doesn't trust America, which is a lot of people. I wouldn't be surprised if 30% of the ME are skeptical that he's really dead. Of course some still won't accept it, but most would. Already we have reports of senior AQ members turning themselves in. Releasing the photo would probably result in more of those.
Also, Judicial Watch and the AP have both filed FOIA requests, and there are probably others. In terms of provoking attacks on our troops, I think it'd be better to get it all over with at once instead of having a second threat wave when the inevitable leak happens.