kazuhiro,
Top one as said is great!, if it was me, and I wanted to "improve" it, if you have
PS, the top seems a touch over exposed, and the bottom is a little under exposed, (losing detail).
I would reshoot with a tripod, first shot expose for the top half, second shot expose for the bottom half, and then merge the two in
PS. Or use a similar technique to get a more even exposure and picking up on the detail lost above.
Great subject with "atmosphere", does it for me!
edit: Nicely framed with the tree branches in the foreground