I have finally designed a watermark to use on my images. Since my logo header for the site was just words with no pictures or backgrounds, I was able to use that file and adjust the transparency.
I don't like the way it responds to the portrait layout. On the landscape layout it is the correct size. The system must shrink it down to fit on the portrait, and I do not think it covers enough of the image.
I will design a new one at some point, but for right now, this one will hopefully do the job.
This was the last of the image theft protections that I needed to get done. One more thing to check off the ever-growing list.