If your motor spins, it's time to mount it to the painting!
Use something pointy to make a large hole in the center of the moon. This is where the motor will go.
Add a piece of double sided tape to your motor.
Stick it to the back of the painting with the white axle poking through.
Stick a small circle of double sided tape to the back of your moon. Carefully stick this to the axle of the motor poking through the painting.