With my Canon 7D I had a practice with changing the aperture. These three images all display varying aperture, the differences are marginal, but from this exercise I was still able to get an understanding of how changing aperture can affect an image. The first image on the left was taken at f/5, as you can tell by the out of focus background and brightness. The middle image was taken in f/8, which improved the overall sharpness of the photo, but made the image slightly dimmer. The image on the right is f/10, as you can see from the background being marginally more in focus. To counteract the reduced light intake in f/10, I boosted the ISO to 2000.
Photographic Journalism 
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