I must say, I much prefer this to Rosemary, which (though the name of a spice, and I like spice names) sounds quite old fashioned. Keep in mind, I'm going by the English pronunciation: ROHZ-muh-ree.
This name has also been used frequently in The Netherlands. While it might still be used sometimes nowadays, it is rather rare and other forms like Roosmarijn and Rozemarijn are much more common.
Rose-Marie is the main character in the Vampire Academy series. She is gutsy , strong and opinionated. She goes by Rose. I love this name it makes me think of someone who is dark haired with rosy cheeks probably because of the character.
Pretty, though I agree with the comment saying it's a little long. If its really that big of a deal, they can just go by Rose/Rosie or Marie. I want to name my daughter Marie Rose :)