To change a selfie in the Waldo Photos App:
Open the Waldo Photos app and click on the Faces icon in the bottom row.
Tap on the photo of the "face" you are wanting to change. Once the page pops up, select “Update this selfie” to either take a new selfie with Waldo's help OR you can upload a new photo by tapping the small picture in the bottom left of the screen which will take you to your camera roll where you can select a photo.
Be careful - if you see “Delete this face,” don't tap it! This will cause you to lose all paid subscriptions associated with it.
An ideal photo is recent, well-lit with a big smile. Avoid cropping, filters, shadows, blurs, glares and accessories (hats, sunglasses, etc...)