Here's how we'll wire the NeoPixels, 10mm eye LEDs, and speaker. Power will be provided by a power supply plugged into the HalloWing's USB port.
Next, plug in the jumper wires as shown, with the anode leg wires in D13 and the ground leg wires into G for ground.
Now, you can plug the NeoPixel strip into the NeoPixel port on the HalloWing, then loop the strip into the skull. Face the pixels inward to avoid seeing too many individual light sources.
Finally, plug in the speaker and USB micro/B cable for programming and tuck the electronics into the skull. Next we'll be programming the HalloWing.