Interesting choice. I wonder what it would've looked like with blurred writing a sharply focused rose? It doesn't seem like the actual words are important even in this version.
Good representation. The bg looks somewhat unnatural, considering the type of letter - I guess I'd just expect to see it on a desk or a pillow, not plain blue. The motion blur on the rose is an interesting element.
The depth of focus in this image could use a little adjustment. I really want to read the entire message but can't. This forces me to look to the flower for a focal point and it isn't.
I don't quite know how you managed to make this image look the way it does, but I find the blurry rose (that looks like it's trying to escape off the page) to be very disconcerting.