What's the best way to (emotionally) deal with stolen artwork?

Paradigm

If I share artwork that I made on the internet I accept that someone will use it for whatever they want. Its a bummer if it bothers you, but you hit the nail on the head that its too much work to prevent them from doing so. I'd say if you aren't actively using your art as a source of income it's probably not worth even thinking about. I've only had it happen once and I was actually kind of honored that someone thought my work was good enough to use. I'm not a professional artist, so my opinions on "stolen" art is pretty soft.
 

LeatherGryphon

That's what I do, I place at least two disguised logo watermarks in my images.  One is prominent but looks like part of the scene.  The others are more cleverly obscured.  And I never publish full resolution images on the Internet.  If it ever comes down to a contest I can point out the watermarks, and provide the original files, and full res renders.  (Although sometimes even I have to hunt carefully for the better disguised logos, especially in the lower res renders.)  It's a "Where's the nearly invisible Waldo?" game.  I've never had to use them, but they're there.

Galaxy

Emotionally, for me, I am glad to say my end results or work (2D stuff) is actively sharing hundreds (yes hundreds) of websites including app, even including lot of Facebook pages by individual users.

Another part is after using Daz figures in my work, sharing is increased recently. Thanks to Daz Studio, PAs and other many artists etc.