{1} A head may be a symbol of intellect: rational as distinct from intuitive thought {see Personality Types}.

{2} It may symbolize the conscious ego as distinct from the unconscious {which might be represented by the abdomen or solar plexus}.

{3} It may be a symbol of masculinity.

{4} A monstrous, horrifying head probably represents negative - because repressed - drives or processes in your unconscious. Try to follow Perseus" example. The Gorgons" eyes turned to stone anyone they looked at; but when Perseus succeeded in cutting off Medusa's head, the winged horse Pegasus sprang from her body. This may be seen as symbolizing the psychic or spiritual development that results from facing up to whatever is fearsome in one's unconscious.

{5} A two-headed creature may symbolize either duality, antagonistic opposites in your psyche or the {needed} union, or bringing together, of opposing psychic qualities/functions/forces - for example, masculine and feminine; conscious and unconscious.

Reference: Eric Ackroyd