I especially like the composition of several of the shots. Good use of the "rule of thirds". I do professional underwater photography, but do very little above the water. I also use the Canon 400D and love the shots it can take. What lenses are you using?
My favorite was the mushroom :3
Very mystical and mysterious.
It almost seems to tell a story.
When I take a picture of something like that, I "create a story" and make a whole theme to my subject.
You composed these very beautifully!