When you make this boutonniere, always keep in mind that the rose is the focal flower. All the other elements of the design is to compliment the main flower - not overwhelm it.
Place the first wired pittosporum leaf on the backside so that the leaf peaks out over the top of the rose.
See how the green elements are forming a frame around the focal flower. They are bent and molded to fit the and compliment the shape of the rose.
The pieces are not splaying out wildly in all directions. Wiring all your pieces ensures that when your boutonnieres are pinned to the lapels, the look is exactly as you want it to be.
I now add a second leaf, tucking it under the bulb of the flower head on the right side of the design.