Step 1: A Picture is Chosen
The spot the ball competition organiser, or whomever provides the pictures to the organiser, first chooses a picture for the competition. Generally pictures are used in which you have multiple players and you can usually see the players’ eyes and make some sense to what is happening in the picture. This is of course so that the skillful judging and placing the spot is possible, so it’s not just complete guesswork. It is called a skill-based game after all. However, sometimes the pictures can be less clear, for example sometimes pictures are used where you can see no eyelines of the players, making spotting the ball harder.
Let’s use a picture as an example in which the player from the Blue Team is about to head or has just headed the ball. In reality this would be a very difficult picture to judge and decide where the ball is, as you cannot see the players’ eyes at all and the ball could be headed into almost any direction.