When I take photos I like to get as much variety in my images as I can. I do this for my personal work because I like to push myself and otherwise I get really bored! On sessions I like to offer a variety of images in the set so there are lots of great images that all look a bit different from each other.
Here is a little example of how you can really change the look of an image by changing your point of view. Not only is this image a different angle but it also gives it a different look because of where the light is. One is brightly lit and the second image is more spot lit on the subject with a dark background. Maybe it's the photographer nerd in me but I think getting these different looks is really cool!