This style of bouquet is also known as glamelia or composite rose bouquet, they were very popular in the 40s and 50s. The bouquet is essentially one large flower assembled from the petals of around 20 roses. It is a labour intensive method and is definitely a task for a skilled florist. Hundreds of petals are painstakingly attached one by one.
Carol - Hannah loves this bouquet. It has the amnesia roses, quicksand, and I guess white or off white. Since her dress is white, I would probably go with white. But she would also love dusty miller around the perimeter if it doesn't get too wimpy.