@Zintenka 's solution is pretty good however, there is one flaw. Since the watermark is so hidden, it’s also its downside.
(Im not gonna link the photoshop tutorial for reasons), but its possible that as long as there is enough of the background/original picture (which there is alot I mind you) then given time, the person can very much just hide the watermark or blend it in:
https://gyazo.com/787e6bac3dae4b7df70b3ac4ffd0d637
You may see a faint name (egotisms) and a line going through it. However before, the line was much more opaque/a full nearly-nontransparent line. However with just a tutorial online and a little dash of work with photoshop, it can be mostly be ridden of with enough time. Making it more transparent allows for it to be easier blended in.
@orangewarrior78’s is a pretty good solution as even though a little more intrusive, as he said before, nobody is gonna care for it as long as they can see the work.
Essentially, watermarks are made to make the work as difficult as it can get to steal. Lowering the quality, size ratio, cropping it a little, anything to make the work less of its self while still being very much easy to see is a good way to protecting your work.