I found this very informative and well-written. The concepts discussed were coherent to someone like me who does not have a deep knowledge of visual art. I also never felt talked down to or that anything had been dumbed down.
I do wish that the analyses of O'Keeffe's pieces in relation to their inspirations had continued throughout the book. The latter half dips into a tangential narrative that I found somewhat irrelevant. Albeit, I suppose speculation is bound to be found in any sort of biography, retrospective, or analysis. I perhaps just have issues with anything that even slightly reeks of the desperate, pathetic, self-insertive "What about me?" mentality. That being said, the latter section was not entirely abhorrent.
Overall, I would highly recommend this to anyone interested at all in Georgia O'Keeffe's work, especially if you're interested in her New Mexico landscapes.