So I printed the outline of the watches, cut one out, and wrapped around my arm. My measurements were closely true to size, just the ends of the band slightly overlapped. I had to make the shapes (heart, circle, diamond) bigger to hold the watch face and from the look on my wrist, it is not too big. I like the size. I can really see this turning out pretty cool.
I think some small adjustments need to be made and I will be ready for the first 3d print of it.