Now that the circuit test is working, I need to sew it up using conductive threads. But I needed to determine where to place the components before sewing them.

All the components will be sandwiched between the painting and the tulle layers, so there won't be components showing. This means there's another interfacing layer needed where the components will be sewn on. How to know where to place the components on the interfacing layer?

I taped the LEDs onto where I want them to be on based on the graphics. Then I mark the locations on a piece of paper. 

I use a tulle as the interfacing layer. Since it's transparent, I can sew the LEDs on it with the paper together, therefore achieving transfer of the locations on the interfacing layer. 

Sewing on tulle against a piece of paper is also a technique I used for the Twinkle Nail project. As tulles are very flimsy, the paper helps create rigidity. Peeling off the paper afterwards give a very nice flexible circuit. 

Because tulles are porous (and the base layer is also made of tulle), the conductive thread may touch my skin. This may short the circuit. So I added another fabric to isolate the circuit from my skin.

 Now, you can insert the soft circuit in between the painting and base layers.