From M.P.Hall collection of texts.

Is represented here the generaly idea of the Magnum Opus.

Description :

Chaos behind them.

Sun and Moon on the top, holding respectively :

Sun :

Black Stage with a crow.
Red Stage - Rubedo as a King.

Moon :

Green Stage - viridis, as a peackoc.
White Stage as Albedo represented as a swan.

Both are upon a sphere/microcosmus egg, vase of the Art, containing an Ouroboros with three head.

Assuming that these heads are for multiplicative capacity or for "Salt, Sulfur & Mercury" is not indicated clearly.