How is the work of Frida Kahlo and Georgia O'Keeffe different from and similar to that of their partners?Georgia O'Keeffe was married to Alfred...

Frida Kahlo’s work is similar to that of her husband Diego
Rivera in style.  They both painted in a naive style similar to that of the Mexican Folk
artists.  They both painted figures that have a flat quality often with bold outlines
defining each figure and it’s parts.  Diego was active in the communist party in Mexico,
so the subject matter of many of his paintings dealt with the life and plight of the
working man in Mexico.  Frida on the other hand is considered to be a surrealist
painter.  The subject matter of her work often involved the expression of the physical
and emotional pain she experienced throughout her life.  She is quoted at
fridakahlo.com/ as saying, “I suffered two grave accidents in my life… One in which a
streetcar knocked me down and the other was Diego.”  Frida painted many self portraits
and many of her paintings were quite small.  Her husband, on the other hand was
primarily known for painting large scale murals.

Georgia
O'Keeffe was a painter.  Her husband Alfred Stieglitz was a photographer and gallery
owner.  Georgia is known for her large canvasses depicting large close-ups of flowers,
many of which are said to be sexually charged and reminiscent of female sex organs. 
Alfred was also known for creating some sexually charged photographs many of which were
portraits of O’Keeffe herself.  He also created a series of plant and tree close-ups
which was said to have inspired Georgia’s first  flower paintings. Both Alfred and
Georgia created many works depicting the landscape of New York City.  Georgia soon grew
tired of the city as a home and in terms of subject matter, which led to her discovery
of the New Mexican desert.  Alfred on the other hand loved New York and his most well
known subject matter was the landscape, culture, and day to day life in his beloved city
as it went through the changes associated with the turn of the
century.

You asked for some additional resources: The
PBS-American Masters website has a great page on both Alfred Stieglitz and Georgia
O’Keeffe at href="http://www.pbs.org/wnet/americanmasters">http://www.pbs.org/wnet/americanmasters. 
There is great info on Diego Rivera at  http://www.diego-rivera.org And a great bio of
Frida at http://www.fridakahlo.com.