The English songwriter Lianne La Havas may be young, but her voice marries youthful lightness with a gravitas most often ascribed to artists well beyond her 25 years. Blood, her second album, builds on the immutable grace of Is Your Love Big Enough?, her 2012 debut. Whereas Is Your Love Big Enough? looks outward for validation, Blood is dynamic and poignantly self-assured in its introspection. She is deft and adaptive, at once inspiring dancing and melancholy reflection: La Havas is always in motion.