1
Define the requested change
Write down whether you need to replace one face in a still, edit several people in a scene, or work across video frames. If the real goal is to restore sharpness or change scenery, face swapping is the wrong category. Describing the intended result prevents a familiar brand name from deciding the task for you.
2
Check fit with your material
Look at the source and destination images separately. Similar head angles and visible facial features give you a more meaningful test than a heavily cropped portrait paired with a profile shot. For video, include a segment with movement rather than judging a single thumbnail. Check accepted inputs on the actual service before preparing a large batch.
3
Review output and obligations
Inspect edges around the face, skin tone, glasses, hair, and consistency with the surrounding light. Then consider consent, permitted uses, and whether you can remove or replace the source material if plans change. Visual quality alone cannot settle whether an edit is appropriate to publish.