The reef is open then? I know there was some update today, but I haven't managed to get online since. If the reef is open and Petra is giving quests, I say go for it. Update her picture while you're at it too.
So, I've got an image of Saviks but, so far, getting a profile shot of the bounty bosses has been very difficult...
Sometimes you have multiple people shooting them to get the kill, so they're knocked around every which way; alternatively even if it's just you, they barely stand still long enough to have their picture taken!
It might be much better to ask Bungie for a stock shot of them from Turntable when they were previewing them for release. I know a couple of staff who might be able to help out.
I've been taking videos when I run quests like that... which I can later try to find a decent frame of them. But you're right, when four people are wailing on a target with weapons, it's hard to get a nice shot.