Nice image, brides hair merges into the horizon a bit but I think there's enough back-light to get away with it tbh.
Regards watermarking, I used to watermark in the border for my blog images but then when I shot my cousins wedding I visited her parents house for a meal the night before the wedding and there was at least half a dozen images in frames on display from the pre wedding shoot taken right from my blog.
I would have given them for free anyway if they had asked but if family are prepared to do that you imagine how many other people out there are printing your images for free.
A watermark on the image wont step them doing it if they really want to but I think it probably discourages them a bit more than a watermark in the frame.