I'm not talking about pictures, I'm talking about what you wrote. On my main page, I describe what I do (gyotaku) first in general terms and then specifics about how I do it. I can find what I wrote (in my own words) on a few other web sites with no credit given to me. In these cases, it is the general background of gyotaku. In another case, when the person is describing the specifics of what she does, and it is almost word for word, with some minor exceptions.
For one web site, I've sent an email to the website designer asking if I talk to them or the artist about possible copyright issues. For another, I sent an email to the artist asking them to credit me or write it in their own words.