Your English is fine :) I assume you also add your name and contact info into the metadata? I think most people wouldn’t think to check that.
I’ve kinda come to terms with the fact that putting your pictures on the internet puts them in risk of someone using them and you might not even find that out ever. It’s wrong but there are not many ways to fight it, I think the only thing would be to only upload really low resolution versions and only put up the good stuff when someone pays for it.