If you are sculpting, then place your form as usual and sculpt out a very very thin white bead (so you can see the blue performance form through it). Then you need to get another usual size white bead and build a smile line, but put it where YOU want it. When you put your camouflage pink on place it behind your smile as usual, it will probably be sitting on the first thin white bead. Work back as usual. The first white bead will stop the light shining through your work from the back of the nail and it will act as a platform - rather like a tip.
With a tip, tip as usual, smile where you want and camouflage pink....
If you need anymore help PM me x