See My Work, Model A

before fill

after fill

close up of right eye

close up of left eye

front view of eyelashes complete

On this client I used a C curl with lengths 10-14. She wanted a very dramatic style. She has very fair skin and her natural lashes are very thin and blonde. So we went as long as we could in the length without jeopardizing her natural lashes. Because we used longer extensions on her, the extension lashes tend to fall off quicker because the natural lash has a harder time supporting the extension once it starts growing. Some people prefer the look of longer lashes over the longevity of lash extensions.
I always advise to start shorter and slowly work up to a longer size if you desire.