Creating refinement and definition of the nose during Asian rhinoplasty
I think you have done an excellent job of assessing your nose. In order to create the amount of definition you desire as shown in Michelle Phan and Song Hye Gyo's photos, an open rhinoplasty approach with dorsal augmentation and tip refinement using autologous grafts (your own cartilage) will give the most attractive result.
Building the bridge of your nose will result in the disappearance of your dorsal hump while increasing the definition of your nose from the frontal view.
Closed rhinoplasty techniques for refinement
Closed rhinoplasty techniques can accomplish the goals you are looking for. Raising or lowering the bridge can be performed with closed techniques. Osteotomies of the nasal bones are also performed at same time to narrow the nasal bones. Tip suture techniques to the lower lateral cartilages can also be performed with closed rhinoplasty. Reducing the width of the nostril base is accomplished with an alar-plasty.
For many examples, please see the link below to our closed rhinoplasty photo gallery
Yes, it is best to be seen in person to get a better appreaciation of your goals. But commonly dorsal augmentation, tip defining and base narrowing are often performed.