I had some of my art used by a company without credit or pay or any respect of any kind given to me, so I am removing all of my work from the web and only posting images with a watermark. I hate to do it, but it is the only way to protect my livelihood. It would be nice if people were ethical enough not to use one another, but we have a way to go before that ever happens. My art is a part of me and it is a violation to take it and use it as if it has no value. I think it takes something from the work to have a watermark, but I know of no other way to protect myself.