the result from a placement of elements on one artwork.
When you make sketches, you try out different ways to place everything that you want on your artwork. You place things closer or further in the different planes (foreground, middleground, background), you place them on the left or on the right, etc.
To make dynamic compositions (more exciting pictures), try and use diagonal lines: you can tilt your horizon line a little bit, like if you were a cameraman and you were filming a short with your head a little bit sideways.