Reichu: This is the face of the 3rd Angel, Sachiel (with a glaring inaccuracy I'll moan about later). As a symbol (including the "long-beaked" variation), it has come to represent the Angels as a whole, even though this visual motif recurs in very few. I don't know whether or not Sachiel's face is borrowed from actual religious iconography, although it does look an awful lot like a stylized owl face: disc-shaped, two large forward-facing eyes, “beak”.
What do owls have to do with anything? Well, Lilith, maybe. In some of the extremely convoluted folklore surrounding her, Lilith is a demon of the night and her patron animal, appropriately, the owl. The Hebrew word lilith even appears in Isaiah 34:14 from the Bible, where is it often translated as “screech-owl” or another “nocturnal animal that inhabits desolate places”. There is also the possibility that it refers to Lilith herself, a “female goddess known as a night demon who haunts the desolate places of Edom”.*
Of course, that could well be completely irrelevent. Oh, the perils of overinterpretation!!
Note that the demon is the precursor of the "Lilith as first wife of Adam" who first appeared in the Alphabet of Ben-Sira. I'll attempt to add refs for all this crap eventually, but it's not high on the priority list.
thewayneiac: So,... "The owls are not what they seem"...?