Another important "rule" of composition is that odd numbers of subjects are easier to make into good picture than even ones are. Our minds work hard to relate things together in twos. Odd numbers also create an interesting tension.

Here we have three deer, two being fawns, arranged around the "third lines". Note that the fawn on the right is grouped with the doe which reduces our tendency to relate the two fawns together as a two. Also, the three heads form a triangle if you draw a line between them.

This brings up another principle. Is is useful to visualize lines and shapes in your subjects. Note that there are three different lines formed along the spines of these animals. They are also at three different heights. Also, the fawn on the left has one ear just tipped away from the camera. All these little details add interest in the picture and draw you in.