Mostly, it's been harmless sharing. Someone added an inspirational quote to it. I've seen it most often at Pinterest, Face Book, a number of meme sites, and a few counseling sites. Nobody has claimed credit for it, but I had to scroll through around 7 Google pages before someone bothered to include a link to your DA site. I think I saw it with the quote on a t-shirt which means someone is trying to make money off of it so you might want to investigate that.
Anyway, I'm glad I was able to find your DA site because not only can I give you credit for your work, I can also see your other work too. Yay! ^_^