This photo captures the motion of a young girl. The detail in this photo is very thorough and the technique used to capture it brings out the main subject. I think that the color choices were appropriate and help to capture the youthful feel of the photo. The blurred motion gives the photo depth and movement and creates a more capturing image.
To avoid having too much light when you use long shutter speeds you can do many things. Some of the techniques include, slowing down your shutter speed, securing your camera, using small apertures, decreasing your ISO, and trying a neutral density filter.