THE (UN-)DAILY PIC: This image of David with the head of Goliath, painted by the Neapolitan artist…

THE (UN-)DAILY PIC: This image of David with the head of Goliath, painted by the Neapolitan artist Andrea Vaccaro in about 1630, was one of my favorites from &ldquo; In Caravaggio&rsquo;s Light ,&rdquo; at the Museum of Fine Arts in St. Petersburg, Florida. It&rsquo;s a show of gems (and not-so-gems) collected by the late, great Caravaggio scholar Roberto Longhi. In the Vaccaro, I can&rsquo;t get…