Line,Color, and Texture

http://www.flickr.com/photos/mcmumpitz/6158095639/in/pool-467062@N24/
The subject matter is a reflective building.
Low Angle
It is a slight angle with a reflective surface allowing you to see other objects.
It is successful because the building is really reflective allowing you to see other objects when looking at it, also it makes it appealing the the human eye.

http://www.flickr.com/photos/droopydogajna/5924479800/in/pool-71332142@N00/
The subject it the bright purple at the end of the flower.
Extreme Close-Up
All the other colors are either black or very dark, so the only thing you really see is the bright purple at the end of the flower.
It is successful because the bright purple catches your eye and non of the other colors do.

http://www.flickr.com/photos/24939776@N07/2626246543/in/pool-70176273@N00/
The subject is the smooth surface of the canyon.
Close-Up.
The way the photo is taken it is looks really smooth and has a really nice color of orange.
It is successful by making you want to touch it cause it looks so smooth and nice.