This site
http://www.clipartbest.com/
is illegally redistributing at least one of my images. I suggest you check for your own. They have a contact button where you can complain. I've just sent my complaint, so I haven't had time to hear back from them. Further proof that you can't trust the pedigree of any images without checking for them online.
1. Give them a warning letter.
2. wait 1 week to see if they remove the picture.
3 if they don't remove it, find out the location of the site owners
4, Take a vacation to their country and consult a lawyer while your on vacation.
5. Give the lawyers all documents and proof of ownership.
6. the lawyers only get paid a percentage if they win
Its a good punishment and head ach for the website.
This site has at least two of my images in this particular page. I think they are illegally redistributing most of the images on there. I suggest you check out the whole site. I intend to. They have the hide to insist on a particular way of telling them to remove images. They deleted my comments and links that I placed on the page where these two images are. http://logo-kid.com/pretty-purple-background-designs.htm
Okay, the above site sent me an email to say my images were removed. I will check later. At least they had the decency to do that, so I'll remove my judgment from the above post. :o)
This site contain one of my images: http://www.thecanvascompany.com.co/naturaleza.html
Picture i4 is mine. I'm going to contact this guys
Let us know how you get on, Miguel. It's always annoying to have to chase up on image theft.