An italian painter whom died 1610, he learned his art from Simone Peterzano who learned under Titian, Caravaggio's work uses Chiaroscuro (emphasis on light and dark) to an almost theatrical extreme and created naturalistic pieces. They also are a good place to start looking!
Just look at that, sheesh.
This beautiful pofile uses the chiaroscuro previously mentioned, the background denies anything but focus on the subjects, and we can see a natural light hitting the portrayed from the front and above, the softness and light beige, golden colour suggest natural sunlight in a pretty dim room. Possibly from a window or an airy space. Its not bright lighting and as such all the details are still visible which may not. What I find interesting it the colour palettes used looking carefully theres greens oranges and blues and whites primarily used, with red used to touch up the nose, lips, ears and eyes. I'm assuming that the green is the base, as many portraits would use this to create a realistic pigmentation to work on.
The details look fluid and effortless and make me very jealous. Care has obviously been taken to soften them as they fade or harden them where focus is needed. His lips puckered in perhaps concern, disagreement or wariness. the darkness is more emphasised to fit the emotion and to the light source. While the wrinkles of his forehead are lighter as they're exposed more to the sunlight than the rest.