Here are a couple of sketches / paintings which show trees, the second is more about other things but the trees are an important part of the composition.
The first is called, "The Dead Tree" and was inspired by a silver birch which had fallen but was propped at a crazy angle by other trees which were supporting it. Almost poignant, as if they were trying to help it. Gosh what crap! Anyway here is the sketch, it was in soft artists pastels.
The last image is again a pastel, It is a "copy" of a painting I saw in an exhibition - I just wish I could remember the artists name. I was so taken with the whole image I had to try and work it out of my system. The tree here is more of a shrub but who's counting?
The double focal point is from the original but I have not obtained the same satisfactory balance and it seems stilted. However I still like it.
Why not browse over to my lens ( What is a lens? It is simply a single page web-site which focuses on a niche subject) and see what I have to say. The images are not repeated in the lens.