Choose clear photos
For a zombie couple video, use separate portraits with one adult in each. Keep the face visible and avoid sunglasses, strong filters and distant subjects. Photo 1 stays human; photo 2 becomes the zombie partner. Similar lighting and a comparable crop give the model clearer references than two very different pictures. Use a normal portrait for your partner, because the story requests the transformation. Check the two previews before starting so the roles are assigned as you intended.