Choosing the right angle for a photo can make the difference between having an incredibly boring photo and a really interesting photo. In general, taking a photo straight on to the subject will result in the most bland photo, as the photo is showing an angle that we see every day. When you introduce a new angle, the subject instantly becomes more interesting. There are multiple options when considering angles, and these depend on what type of photo you are taking. As seen in the example above, if the photo is of someone walking (as in a protest photo), getting as low to the ground as possible and angling up is a good way to dramatize the photo. In the case of a protest, people are taking a stand for something they believe in. By having an upwards angle from the ground, you give the person a sort of heroic position in which he or she appears to be towering over the photographer/observer.
When taking sports photos, you are generally on a field with some sort of goal at each end. In this case, the first angle to consider is horizontally left and right. One of the worst mistakes you can make is standing on the sideline in line with the action. This will result in either no eyes of the player showing, or only one eye. Additionally, this gives the photographer only about a second to capture the action, as the players pass by quickly. To avoid this, stand at the end of the field or near the end of the fields in which the players will be running or facing towards the camera. Not only will this show the entire face of the player, but it will also show all the action happening on the field behind the player. It will also give the photographer lots of time to take the photo, as the players are heading towards the camera and are constantly facing the camera. Changing the up/down angle on a sports photo can even add a little depth to the photo. Being a little closer to the ground will show the true depth of the photo, even if the ground is out of focus (as it should be). As seen in the photo above, the picture was taken from the end of the field at a lower angle in which the striker was about to attempt a goal, lining up a perfect shot in which the face of the player can be seen while also showing the depth and players in the back of the field.
When shooting, a photographer should always try multiple angles to find the best one to make that specific subject interesting. This will help bring photos to life and make an observer feel captured in the moment of the photo.