The photo of the beheaded girl was from Syria in 2013. Not in Mosul Iraq in 2014. It was circulated by ISIS rebels as propaganda against the Syrian Army but some have alleged it was actually killings by the rebels and then used as propaganda to try and blame Syrian forces for the killings. Either way it is horrible but the who, what, where, and why are all very questionable.
Thank you all. Some things are hard to authenticate.