Very nice photo, the top looks like desert / salt landscape, but when you look down you see the nice ripple's of the water :)
Black&White conversion is a good choice, make's it more dramatic.
Too bad the full reflection isn't shown on the water surface :)
This is a nice image - the b/w conversion works well here.
The one thing I would perhaps do differently (and I think somebody else already said it) is to try and get the full reflection of the treein the shot, it would have a little more impact. It's an image that actually works well with a centred subject.
This has a really nice composition to it. Grabs you and pulls you in.. at least, it's the one that pulled me in the strongest in your portfolio.
I'd suggest going back to this site at varying times of day.. with different weather patterns.. different lighting.. see what happens. This high-noon-ish looking shot doesn't really do justice to what this photo *could* be.
This is very Ansel Adams-esc! I love the tones and idea. The subject is quite interesting. One suggestion I have is that you leave more room at the bottom of the photograph so that the entire reflection shows. That way, it would appear to be two trees.