Here’s a good example of composition from Henri Cartier-Bresson:
This picture is included in the Somerset House Cartier-Bresson: A Question of Colour exhibition. The exhibition runs from 8 November 2012 to 27 January 2013. Opening times are 10.00-18.00 daily, with late opening until 21.00 on Thurs 8, 29 Nov & 6, 13, 20 Dec. Admission is free.
Other places to see Cartier-Bresson pictures on display:
[I’ll add more to this list…]