Design: Serpent-Cup

Over and over again I am trying to add symbols for book-cover designs. I think the above design was made years ago and I've still not put it on a book.

The symbolic elements are:

Snakes entertwined: Snake = Rebirth, Regrowth. Knotted = Bound, connected, etc.

Cup = Female. Life. (Holy Grail-ish), Plenty, etc.

Sun/Moon = Balance between male and female.