Clouding around the edge of the picture. Contrast of the black and white. The light in the back of the picture pops out more so you notice the child and the ball. Use a silhouette cut-out to make the silhouette of the child?
As Ellen was running away from Espinoza she programmed her clothes to look like the brick wall that was behind her. Espinoza was able to see her because her hair was a different color then the brick wall.