let me see if I can give you my take on how it looks like it is made.
start here with making the ribbon flowers. http://ribbonflowers.blogspot.com/
I am thinking 7/8 for the small flower and 1.5 for the bigger flower. I made a template out of a piece of cardboard so my flowers are all the same size. After I gather my flower, she shows it with the petals turned down, I turn my up.
As for the bow...after you make the flowers you will them be able to decide how big you want to bow to be. It looks like in the pictures of the other flower bows. She does just a straight center and puts the ribbon flowers on a clip that can clip right onto the center of the bow center.
I sure hope some of this makes some sense to you. Show pictures of your flower bow when you are done. I am excited to see how it turns out.