In my opinion itīs simple. If you made it by yourself itīs your intellectual property and itīs copyrighted. No one can copy and modify it let alone expose it on their website without your consent. They even removed the reference to you or your website.

I would send them a friendly letter stating that although I am happy to see that my work is important enough to be copied and used itīs copyrighted work. I would then propose a way of linking the website. If they didnīt reply I would have a lawyer compose a letter for them.

If I were you I would at least add some small watermark with Đ and your name and/or a text linking your website to your photos. Also several lines of text like: "All rights reserved. No text or image from this Web site may be copied or retransmitted unless expressly permitted by..." etc. at the end of every page/article should at least stop some people from doing so or remind them that they are breaking the law.