Those are some really nice photos. I'm not sure I like the darkening of the top of #3, and #5 looks almost confusing the way the puppy is splayed out all over the place! The pics are still pro-worthy.
The watermark, however, really detracts from it. There are 2 things I can see that are wrong with it:
1: It covers virtually every part of the photo. It's really hard for potential buyers to get an idea of just how crisp and professional these photos are when it's covered in text. Try reducing the size a bit, and maybe putting it slightly off-centre.
2: There are too many effects! And by "too many" I mean "one". That beveling effects also really detracts from the photo, as it makes people look at that rather than the subject.
Certainly take that off to leave yourself with a watermark that will both stop copiers and allow people to appreciate the picture, even if it looks a little bland. It's a copy prevention measure, not an art contest!
Still, these are some really fantastic photos. I can't wait to see more of your stuff.