What a nice shot. The 'under lighting' is so unsual visually that it just makes everything kinda POP. Lots of texture, and it's very busy, but in a very good way. The eye just kind of roams around, finding more and more stuff. I like that the composition has 2 peices, the lower tree/light lines that guide the eye into the background, with the primary tree competing above in the forground.
Kunihiko, this is spectacular. For my own enjoyment I put it in photoshop and inverted it. The tones are so balanced it worked either way! Beautiful balance.