Taking a photograph freezes a moment in time, and with that in the back of people's minds they tend to freeze for the shot. That is great for reducing blur and letting that practiced pose out for all to see; however, people are more natural when they aren't posing, and often the better photograph is one that captures them in their natural state rather than posed.
This presents a challenge for photographers; our goal is to capture a reality that is both natural but also posed in the frame. Choosing the right moment to snap the picture is crucial, as well as the ability to creatively deceive the subjects.
But the most enticing aspect of dynamic photographs is to bring a frozen moment in time to life, activating the viewer's imagination to relive the moment in the photograph. Images of a great laugh, dance, run or jump can entertain the viewer while making the subjects look alive and engaged.
Additionally images can show evidence of movement, either a record of such, or movement that is implied. Sometimes processing can highlight and exacerbate a sense of movement, such as in the first image below of sand showing where the tide left a record of the pattern as it flowed back into the sea.
Dynamic photography might be the toughest kind to master. Where composition is lesson one, great dynamic photography is the product of a level of mastery that not every photo-bug can accomplish.
