1/320 sec - must have been a bit windy?
This photo was a while ago now, but as I recall the shutter speed was more a function of light levels. I wanted the blurred-out backdrop of a large aperture, and 1/320 was the shutter speed under the full-sun conditions that gave a proper exposure.
As I've gotten better at photography, I've learned to structure more of my shots more around aperture than shutter speed.
Lovely image. Very inspiring, thanks for sharing :)
Nice composition. Very nice.