I think this photograph shows selective focus, because it focuses on the football players fighting on the ground and everything else is a little blurred out and out of focus. Your eye automatically goes to the fighting football players, making them the main point, or center attraction of this photograph. The rest of the background is blurred, slightly but noticeably creating an interesting and different feel and illusion displayed by this photograph.

I think this picture shows depth of field and linear perspective. It shows depth of field because there is a good amount of distance from the objects closest to you, and the object farthest away from you, It shows linear perspective because of the tile lines on the floor, and once again, the amount of distance in the picture. The lines and the objects converge in the distance, adding on to the effect of depth of field in this photograph.

I think this picture also shows depth of field and the diagonal line. Depth of field because of the space between the '#10' football player, and the cheering crowd at the other end of the field/picture. This shows the diagonal line, because if you follow the heads of the football players, you'll see that they move your eye in a diagonal line across the field. The white line drawn on the football field helps too, because it gives you the essence of an actual visible diagonal line.