Your shot with the Lexposition sign is a great idea.
Be very careful of a black background with any dark accessories. The hat removes her head. The sign distracts from the model. Next time, try a flash to highlight the dark accessories, dont use a sign, try using a sheer white scarf (with the black background). The affect will be the same, just not distracting.
I read the quote on the watch with the harp. BS. The watch is fine. However, pose the model with a seriouc expression, concentrating on her playing of the harp. Eyes can be closed.
Poses are great, but remember, NATURAL is always better.