Here's another way to expand your portfolio of successful renderings: When a person, animal, or vehicle is positioned fairly small in your rendering, make sure the subject moves into - not out of - the composition. This keeps the viewers attention directed to the main center area, rather than having the eye wander distractedly to the edge of the render and out of the picture.
Of course, as with any rule, there can be artfully stylish exceptions, and when a subject occupies a big part of the render, this guideline may not even apply. But, in general, when a subject moved or faces in one direction, leave room to breathe in front of the subject. Viewers will find this visually pleasing, as opposed to a more unsettling placement of a subject near a rendering border and facing toward that close edge of your rendering.
Your subject doesn't even need to be moving. Plus, this concept applies not only to human subjects but also to animals, cars, boats, and even statues. Other objects may have a front that "points" in a particular direction, such as when rendering a house or vehicle from the side. Likewise, a tree that leans, for instance, should tilt toward the middle of the scene.
Yes, this strategy is yet another thing to worry about when compositing a rendering. But, trust me. You'll soon get the hang of this concept of directing the movement toward the center of your rendering.