Whether leaping to ceilings as a decidedly beautiful vampire in the “Underworld” film franchise; posing nude in front of a drawing class in “Art School Confidential” (2006); or steaming up the screen in period trysts with James Franco in “Tristan & Isolde” (2006), British actress Sophia Myles managed a diverse array of roles in her still-blossoming career. With the television series “Moonlight,” debuting as part of the CBS fall 2007 schedule, she returned to her supernatural roots, playing a mortal woman, Beth Turner, who falls into a relationship with a private investigator (Alex O’Loughlin)