A dead, slimy hand slid out from under the cloak[...]Then it raised both its rotting hands—and lowered its hood.
Where there should have been eyes, there was only thin, gray scabbed skin, stretched blankly over empty sockets. But there was a mouth...a gaping, shapeless hole, sucking the air with the sound of a death rattle.
And for the first appearance of a dementor Rowling talks about drowning. I don’t know about the skin over the eyes, but the rest of it explicitly points to death.
Green? No. From the American edition of PoA:
And for the first appearance of a dementor Rowling talks about drowning. I don’t know about the skin over the eyes, but the rest of it explicitly points to death.