Pick of the paperbacks; Portrait of an Artist: A Biography of Georgia O'Keeffe, by Laurie Lisle. New York: Washington Square Press/Pocket Books. $4.95.

While O'Keeffe's blank refusal to participate in the research for this biography has handicapped it somewhat, Laurie Lisle has unearthed enough material to fashion a remarkably composite portrait. O'Keeffe is as starkly original as her work. In intricate detail we tearn of O'Keefe's work habits, her influences, her inspiration, the evolution of her style, and her relationship with her mentor-husband, Alfred Stieglitz.