Yeah I'm familiar with Pollock.
The photo loooks authentic (not set-up / fake),
though, basically, I'm not getting why a suicide bomber would push the button in what looks like a private setting.
Standing against a wall - which is hardly damaged.
It sort-of looks like he just wanted to blow himself up in a quiet corner or something.
Also (I'm not Dexter Morgan, but) the distribution of blood in the room looks weird.