Grainy on Purpose

Girl twirls on a ride called a yoyo. Each summer, a carnival visits my town.

  Sometimes grainy photos aren't a bad thing.
  To capture the motion of that girl, the image was underexposed. Graininess replaced smooth tones. Dark areas, including the clothes, lost their details. 
   A flash could have revealed those details and eliminated the grain. But at what cost? The red glow on her face would have disappeared. So would the natural ambience.
   Photography is a compromise.