I can spot Rom the Vacuous Spider (one with the black-dotted mask), Celestial Emissary (one with the bulging white hat below), Witch of Hemwick (holding a skull), Blood-starved Beast (one with tattered brown clothes beside Rom), Amygdala (one with orange-eyed earrings), Ebrietas (right below Moon Presence) and Darkbeast Paarl (one with the black skin). No DLC bosses, i think.