What this is usually for
Most hug clips are made for one of two reasons: two people who were never photographed together, or one person who is no longer here. Neither is a novelty use, which is why the template is tuned toward warmth and stillness rather than spectacle — no dramatic camera move, no stylisation, just the approach and the embrace.
Getting a result worth keeping
Match the two sources as closely as you can on angle and light. A front-facing portrait pairs well with another front-facing portrait; a sharp profile against a soft three-quarter shot tends to produce one convincing person and one that slides. Resolution matters more here than in most templates, because the face has to survive both the walk and the moment the two heads overlap.