C&C per req:
1. Interesting image, and nicely composed, but with apparently two main subjects. As was mentioned, the use of selective focus to isolate the gree in the foreground would have made this a better image IMO.
2. This image doesn't seem to have a subject.
3. Nice symetrical composition, however it's suffereing from a slightly skewed perspective and is slightly overexposed in the highlight areas. A curves adjustment to produce the classic 'S' curve will help cure this.
Overall, the images are good technically, and you've got some nice ideas on composition. Remember to expose for the highlights and consider the use of a circular polarizer.
Just my $00.02 worth - your milage may vary.
~John