As a self-described “tall girl” in a dance form usually filled with petite women, Pacific Northwest Ballet’s Laura (Gilbreath) Tisserand has always been easy to spot in the ensemble, but it’s not her height that makes her stand out. She’s been coming into her own as a ballerina, the focal point of a classical picture or the center of gravity in a contemporary work. She gave a wonderful series of performances this year, ending with an intense run of George Balanchine’s Agon, where she and Joshua Grant inhabited the central pas de deux as if it had been made for them.