Question: What artist painted the sets of watercolors that she made exploring a monochromatic palette with designs that were non-representational of specific objects, and was best known for her paintings of enlarged flowers? 
Sentence (from "Blue (O'Keeffe series)"): It was one of the sets of watercolors that she made exploring a monochromatic palette with designs that were non-representational of specific objects.
Relevant evidence: Yes