Hello, in addition to the other website I told you about, here are more that are selling your artwork without your permission, or at least I suspect they don't have your permission:
https://www.fulcrumgallery.com/a117614/Alvaro-RozalenStocktrek-Images.htm
https://www.framedart.com/framed-alvaro-rozalenstocktrek-images-prints-a117614
Thank you for reading. I hope you can contact them and get it removed, if they are actually stealing it.