Here is my HuggingFace Illusion Diffusion tutorial. You can create optical illusions / Squint Images / pareidolia images using any picture including your portrait photos. You'll see tips and best settings for different image types you can upload here.
00:00 Examples
0:12 Opening Illusion Diffusion interface
0:34 Interface overview / explanation
1:23 Default image
2:03 Image with text (hidden message)
2:30 Portrait photo
3:16 List of generated images