Faces Wild is an app of inspired simplicity and effectiveness.
Suggestions (in order of priority):
1. Ability to import photos and jpegs and paint transparent areas to use as backgrounds (could be built in or marketed as a companion app).
2. Online gallery for users' creations from (1) above.
3. Ability to create a virtual light source with variable position/hue/intensity to adjust faces.
4. A small library of overlays (spectacles, hair, hats, etc.) that could be added to the imported face.
Well done again - one of the very few products that has ever prompted me to mail in suggestions.