Nature has infinite variety. Yet the more you observe it and learn about it, you see there are “rules” which govern the seemingly chaotic look of things. For example, trees in general grow in a certain way, which will vary from species to species. But, the idea of “taper” (that is, the gradual diminution in size from trunk to limb to branch to twig) will form an overarching way of viewing tree growth and how trees are constructed. The more you look and study, the more you see these things and the more you will include them in your drawings and paintings.
But, for some reason, we humans want to reorder nature when we start to draw or paint it. We make all our trees alike, or put them all in a row and make then the same size. Our rocks all have the same shapes and sizes, our mountains the same outlines. Why? I don’t know. But, I do know it is a tendency we all seem to have and which we have to overcome in order to compose effectively.
If we are to get, as Carlson says, “the big look of nature”, we must reproduce her forms in all their variety and uniqueness. During a critique years ago a teacher once said to me (pointing to a tree on my canvas) “make it that tree”. “What tree?” I said, not getting the point. Eventually I understood that she didn’t mean I should “copy” a real tree. She meant that my tree should have the specificity and uniqueness (and rightness) that a real tree has. It should be convincing. You can make a simple outline or silhouette convincing. Convincing doesn’t necessarily mean detail or fussiness. It means you create a tree which looks like it is growing there, like it could grow and thrive where you have planted it. And, a tree that serves a purpose in your design idea for your painting.
And of course there is only one path to doing that- observation, study and…wait for it…drawing. So, when you start to compose you have a little storehouse of knowledge about ways you can put some variety in your trees and still make them look right and true.
One of the most obvious things beginning landscape painters do is create equal intervals (spacing) between forms and make those forms all the same shape and size. Like this.
When we are thinking variety then we might do this: