It was a night of different eras and mixed marks for Beverly native Angie Miller on “American Idol” Wednesday. The top four contestants each performed two songs, one a 2013 hit and the other a standard. Miller navigated a stripped-down version of Rihanna’s “Diamonds” for the former and the Gershwin classic “Someone to Watch Over Me” for the latter. While the judges continued to praise her skills as a vocalist they weren’t wild about her rearrangement of the Rihanna tune, with Nicki Minaj calling it “bland and lackluster” and Randy Jackson observing that “it didn’t go anywhere.” The Gershwin drew higher praise, with Keith Urban complimenting her “timbre, clarity, and presence” and Jackson calling it “an amazing vocal.” Miller also got to mix it up with guest mentor Harry Connick Jr., who developed a playful rapport with the teen. Thursday night Miller will discover what the “Idol” voters thought of her performances.