All I can say is that is a massive tree. I do like how this tree seems to be in the middle of everything, you can see the hills, but not much else for miles around, and that makes me think the tree is special or unique somehow..
I'm also really liking the clouds, and the black hill closest to the eye. The way the grass looks is almost the way I see it in Tim Burton's movies.. and I like it
Your project looks great, best of luck to you with it as it progresses.