The Look of Love doesn’t tamper with Diana Krall’s ongoing success, continuing the emphasis on romantic ballads and embracing them with lush string arrangements. At the core, of course, is Krall’s voice. She’s developing into one of the great torch singers, with an approach that’s both direct and subtly nuanced, true to the song and yet deeply personal. There’s a combination of restraint and drama here, as Krall ranges from the confident to the wistful, from loss to playful insinuation, as each song requires. ˝Cry Me a River˝ is bittersweet triumph, while ˝Love Letters˝ and ˝Maybe You’ll Be There˝ maintain the most tenuous emotional hold, at once fragile and resilient. ˝Besame Mucho˝ and ˝Dancing in the Dark˝ are sultry romances wafted on light Latin beats. The songs develop their intimacy in the setting of Krall’s quartet, which usually includes bassist Christian McBride and drummer Peter Erskine and several fine guitarists, most frequently Russell Malone. They’re a superb complement to her voice and piano, and the close communication carries through the depth and sheen added by Claus Ogerman’s rich orchestrations.