From his newsletter:
I was staying with him while recording Devour out in Los Angeles, and he suggested putting a falcon on the cover due to the fact that it is one of the fastest animals in the world and a deadly predator. Thanks to Matt for that killer idea, thanks to Annie for posing with that intense, amazing creature (indoors, no less), and thanks to Patrick Morales for getting the amazing shot and for laying it out so well. The rest of the concept for the cover and the album art came from the lyrical themes in the record ...
So it seems that the lady on the cover might be a friend ...