The theme of "Tattooed David" is that of Yin Yang - the ancient oriental symbol for all opposites in the universe.  Two halves creating a whole: positive and negative, dark and light, male and female, active and passive, good and evil, happiness and sadness, heaven and earth, east and west, etc. etc.
The most obvious Yin Yang we see with this "David" is the West meets East concept...the Western man with Eastern tattoos.  The graphic Yin Yang symbol is judiciously placed over the heart.  The artist divided the figure into "Heaven and Earth", the upper and lower body respectively.  Symbols of earth on the legs, represented by the sky, the sea, and the Geisha on the shore, all lead down to David's feet planted firmly on the earth.  The ascent to heaven is shown on the opposite leg, where we find a warrior monkey with sword guarding the Torii gate to heaven.  A red sunset represents death, turning into flames which represent transition.  In the "heaven" half of the body we have a Yin Yang struggle occurring with the attacking eagle attempting to steal the pearl of wisdom, fiercely guarded by the mythological monkey god.  The tiger and the dragon join the battle against the eagle.  On David's right arm are symbols of the Garden of Eden in Paradise, countered by the snake on the left arm representing Purgatory.