Sort:  

plagiarism is attempting to pass the work of others as your own,
in this case the original work of art is the photograph, of which you then made a derivative work, without crediting the original work, hence, its plagiarism.
Additionally, you are violating the copyright law by monetizing the derivative work without permission from the author.

what is copyright? she painted a picture! this is no longer a picture! this is no longer a photo!
This is called artistic reciprocity!