A friendly suggestion: if you are selling/planning to sell the images and are concerned about theft, why not just reserve them for your agency or stock house instead of posting them in an open forum? Also, while your pictures seem to be good, they don't immediately strike me as targets for theft, at least not any more than the hundreds if not thousands of images already available here in the galleries (many of which are by pros, some very established). Finally, as someone who occasionally works with stock images and original photography for broadcast/publication, I can confirm that Pickett Wilson is correct when he says that the low res images accepted by the RFF galleries of are no use to anyone. They're simply too small to work on TV or in print. The worst that can happen is they end up on somebody's (non-paying) blog or website. But that's the risk we take when we decide to share our work with a multitude of strangers on the Internet.
With that out of the way, welcome to RFF!