I've now completed the short painting trees watercolour course, and found it the most difficult one so far!
I've learned a lot, but so much more practice is needed - anyway, here are my efforts.
I used a photo I found, which had far distance, middle distance, and near trees. I've made quite a few errors here, but I now know where I went wrong, so perhaps I'll have another go sometime, with the same picture.
Every time I go out now, I can't help but look at all the trees - shapes, colours, effects of distance ...
"Supposing a tree fell down, Pooh, when we were underneath it?
Supposing it didn't, said Pooh after careful thought.
Piglet was comforted by this."
A A Milne