Well, it looks like some sort of spike was driven through them. All the previous works that had "slaves" had them with blindfolds seemingly stitched into their heads, too, so... I guess this is just one of the fetishes of whoever commissioned this series.
About damn time. Now to wait another year for the next one.
Little confused with this. She's in a freezer, but her eyes are melting? Or is that just blood from the spike seeping through them? Also...that isn't a generic mind control doohickey about to be screwed into her head, is it? That'd be pretty anticlimactic.