Color harmony Rules

All these images were taken from "The Phaidon Archive of Graphic Design." 

 The designer of this image is R. D. E. Oxenaar; this design is analogous, it really draws the eye with its vibrant use of colors that meld so well together to present a warm feeling.    

  Designer are Vladimir and Georgii Stenberg; this image is triadic, its nice that the colors appear to help give movement to this image.  

  Designer is Aleksander Rodchenko; this image is complimentary, this image is simple but the colors really tie in together to for this design, the orange and the ink blue really do complement each other well.  

The designer is Jules Chéret; this image is monochromatic, and it has done beautifully with the the blending and saturation of such a warm color that just really brings out this vibrant piece.