#13 looks very interesting. I'm not sure about the green pedal floating out. We were also thinking of showing the branch in addition to the flower. Do you think you can come up with a few concepts that incorporate the flower and branch? We don't have to go down this style but this is the only image I could find.
http://penandinktechniques.com/wp-content/uploads/2012/11/Pink-Magnolias-flower-pen-and-ink-and-wash.jpg