I like using paper wire for the stems:
For this peony I'm using two shades of pink tissue paper.
First you need to carefully crumple the paper into two balls and then unfold.
I cut four types of petals, I cut tiny irregularities to them.
I ended up using three layers of each type.
The tip of the wire is made into a tiny loop and dipped into glue. The first layer is crumpled to a ball.
Keep adding glue after each layer.
This was the end result: