It's level, it just plays a trick on the eyes with the more going on in the right horizon ground level. What might be throwing you off in terms of why it looks slightly cluttered is the very spread out tree front and center taking a lot of depth out of the image; you're right to say the focus seems a little unnatural because of it. But overall, I still think it's a great landscape.
Nelleke M'Dear lady you just do this oh so well, you don't just capture scenes or landscapes, you capture ethereal beauty, almost the soul of the forest and what I really adore is that your shot composition is nigh on perfect every time. I am a huge fan and jealous as f**k of your creative vision