In the context of Saint Sebastian Tended by Saint Irene (Hendrick ter Brugghen), explain the Composition of the Formal elements.
A diagonal line spans the length of the canvas from the top left corner to the bottom right. It stretches down Saint Sebastian's tense arm, across his body and down to his feet, an arrow protruding from the center of his chest continuing the form. Sebastian's lifeless right hand in the air forms a triangular shape at one end of the line with the hands of Irene's maid, at balance with Sebastian's feet and left hand that touches the ground in the opposite corner. At the apex is Irene and Sebastian's faces in the foreground, turned away from each other with their positions juxtaposed, highlighting their symbolic relationship and them as the painting's prime focus. Irene's upturned face toward the source of light, graced with a gentle smile, furnishes her with a sense of hope and rescue. It stands in contrast to Sebastian's head, stricken with anguish as his expression is cast in shadow. The heads of the figures create a "pyramidal form," echoing the arrangement of trios prominent in the piece.
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