Using reflections in photography can lead to some amazing effects and beautiful images. Using water, windows, mirrors or any sort of reflective surface can change an image into a work of art. The wonderful thing about using reflections when taking photos is that they can completely alter the image from something fairly straightforward to something richer or abstract or otherwise more artistic. Sometimes reflections can be annoying and certainly not artistic. But creativity and good-quality photos depend on the photographer being able to see things differently, rather than seeing only one part of a larger whole.
Also, using reflected light can vastly improve the quality of lighting available. Diffused light is generally better for taking photos, and using reflected light, either as the main source of light or for highlighting, is an excellent way to capture diffused light.