"Artistic" does not mean of bad quality, so I tend to avoid mirrors, glasses or any other surface that can damage the ultimate quality of a photo.
On the other hand, these techniques are always welcome during wedding photography sessions, because you have to make look good ordinary people with no experience in posing...
With a supermodel like Martina you can dare much more and show whatever part of her body without mercy, because she is always going to look good.
When I do use these cheap romantic props with her, it is just to add new words to our visual vocabulary, or to tell a different story.
After so many shootings with the same model, it is always worth trying out new approaches.