I really like this, I suggest making the trunk a little bit wider and just touch it up a little bit:).
How long does it take to learn how to shade things from scratch? I don't fully understand how it works, I could sprite with just single colours, I try to shade but usually I seem to pillow shade
. I lack detail when colouring my sprites, which is why I rarely ever attempt making them.
But your tree is looking rather superb, I like it how you worked on one part at a time, that way we can see how things are done
, a rather great job if I say so.