Forty-six when he posed for an unknown painter, Shakespeare looks well-to-do, somewhat dashing, and, in modern fashion, his wrinkles may have had a bit of air-brushing.

Thinking of the mid-air beams of light and shadow as actual physical objects is a good way to start, and for a painter that is what it is; shape.

Light color, and the change of air and take on subsequent impressions, painter has obvious effect.