Aperature and Shutterspeed Extremes

The three keys to a good picture is the shutter speed, the aperture, and the ISO. I chose to try and capture four extremes of shutter speed and aperture.
First let's start with shutter speed.

• This first picture the fountain is an example of a shutter speed that would be too slow in order to get a crisp and clear picture of the water. The settings for this picture were an aperture of 6.3, a ISO of 800, and a shutter speed of 1/125. 
• The second picture of the fountain has the correct shutter speed of of 1/1600 with an aperture of 5.6 and a ISO of 3200. 
• The first picture of the tree and the building is has an aperture that is too high which makes the entire picture in focus, but I only want the tree in focus. The settings for this picture are an ISO of 800, a shutter speed of 1/20, and an aperture of 25. 
• The second picture of the tree and building has the ideal aperture in order to get only the tree in focus. For this picture I had an ISO of 6400, a shutter speed of 1/3200, and an aperture of 5.