The first panel in the second row--I love that Allison is "allowed" to be ugly. Like, the double-chin hangover-bleary look isn't good on ANYONE, but Abbadon doesn't sanitize it away. Allison has her moments when she's beautiful and vibrant--and she also has her moments where she looks like THIS.
But on the page above, other than the tiny blue shard, that devil is without a mask, and unlike Vladok/Princess when they are unbound, is pale in color.
My suspicion is that if angels like White Chain grow in wisdom by adopting a bit of chaos/change, then devils grow when they adopt a bit of order. Cio's pale form here might be why she's able to manifest without a mask at all...she retains enough order on her own to do so, and orderly things tend to be pale-colored.
I wonder if, within his box, Himself is also un-masked.