Why are you Watermarking Your Photos?
The location of your watermark should be driven by your rationale for using a watermark in the first place. Generally, people put watermarks on photos to either protect the photos from being copied without attribution, or to prevent potential customers from downloading the image without paying.
If your intent is to make sure you get proper attribution, you'll want to minimize the impact of the watermark while not making it too easy to remove (see our Guide on Watermark Removal Software to see how that works).
In the above photo, the watermark sits on the bottom left, away from the focus of the image. However, because the background of the watermark is completely black, it would be easy to remove. This type of placement is good only if you're only partially concerned with receiving attribution for an image, and is not appropriate if you're actually trying to protect the image.
In this image, a "tiled" watermark has been applied (available in Water Marquee Pro). Because the watermark text is partially transparent, it is still possible to get a sense of the overall image. However, it's very unlikely that anyone would steal this photo, since the watermark is still so noticeable. This type of watermark is best when you're a pro photographer, such as a wedding photographer, who needs to be able to let customers see photos, but needs to make sure you'll get paid for your work.