Major B said:
This is an old and well-respected study and argument about a style, and an entire genre of art called (if I remember accurately) Socialist Heroic Realism (kind of like Holy Roman Empire, which was not Holy, not Roman, and Not an empire). This art is intended to propagandize, and it sacrifices art for a message linking the subject to a superhuman, deified being. By the way, Hitler used it, as did Saddam Hussein, as does Castro, as does Chavez. If O-BA-MA wins, he will be the first democratically elected leader to do so.
More examples below.
Two of the bottom paintings would be great art if it weren't for the central subject matter.
There is another theory in general about the significance of colors.
Red is usually the color of passion, celebration and romance
• Purple is associated with royalty, mystery and mysticism
• Blue denotes security, tranquility and reliability
• Green is the color of fertility, growth and envy
• Yellow is generally related to illumination, brightness and illness
• Black is the color of power, evil, sophistication
• White means purity, truth, coldness and sterility
Now the art work on Obama in the Op for the most part is about perception. To be more attune to the purpose of using red shades one would have understand more about the artist than ones own perception of the painting.