This is a very nice piece! Why was it submitted on Clock Day? That's usually when you try to submit lower quality stuff, no offense to the clocks. I guess it's just a coincidence. I love how it looks like a mouth. Then again, I guess most caves are like that.
It seems like you could put a great story to it. You could make anything out of this character. You get a good clear shot of the green trees outside. The cave doesn't seem too dark. What a lovely picture.