I started making this on my TI-83 calculator as I passed by a tree between classes. For most of my works that I have made on the TI-83, then colored on the computer, I've consider the black and white calc picture and the colored computer picture to be two different, but related pieces. But in this case, I was going though a quick sketch phase with my calculator, so the calculator version was never intended to be "completed." if you would like to see it anyway, I'll give you a link here:
Despite the fact that the TI-83 image was suppose to be a quick sketch, I spent weeks on it trying to get it just right. As school got busy, I forgot about it. One day I suddenly remembered about it, transfered it to my computer, and finished it that day.
I think the trunk blends with the dark part of the grass a bit too much, but I am quite satisfied with how the leaves turned out.