How to Swap Faces with LunaPic>
Step 1. Upload initial image
Step 2. Edit -> Crop image.
choose Circle Tool
draw an oval around the face you want to use
Click the "Copy and Paste" Button.
Step 3. [you can alternatively upload a new image to use,
but in this example, I used the same image]
Step 4. On the Paste image from clipboard screen:
Select Cutout Shape: Oval
Edge Fade Pixels 2 or 5
move and place the face on the new person
Click "Apply pasted image" button
Step 5. Repeat for multiple people.