This poem reminds me of the Scottish ballad "Twa Corbies."
https://www.scottishpoetrylibrary.or...e-twa-corbies/
You have the same theme of abandonment and death, linked to crows. I assume that the two who cackle of heaven and hell are reminders of religion, and its promises about the afterlife. Your third crow is a mystery, but I think it is linked to "blank eternity" and therefore suggests nothingness after death. I like that you make the reader think rather than just labeling what it means. "Pauper's pence" signaled that we are going back in time stylistically, though not actually. I like the mood of melancholy resignation.
Susan