Presumably people who are 'not photogenic' are not made of some different type of material that reacts differently to light than photogenic people. The problem must either be a lack of good quality photographs or an issue with uncomfortable body language when being photographed.
The camera also adds (visual cues that make it look like it adds) weight, and messes with color. My best friend just got married and had lots of photos taken of her and her husband. He looks fine because he starts out skinny as a rail and his coloration works in the photos. But in the very same photos, she develops a blotchy complexion and her hair color looks unnatural and gross. And while she's not fat, the extra ten pounds on the glossy photo nudge her a little that way. Her body language looks fine in photos (and if she were tensing up, wouldn't she also look tense on video? Video of her looks much better), and the quality of the photographer or camera can't be the issue because in the very same photograph her husband looks exactly like himself in real life and she looks weird.
I don't know exactly what the problem might be with your friend's wedding photos but in general the problem of how to make people look as good as possible in photos is quite well understood. There's an entire industry devoted to doing it. I can list several technical errors that can appear to add weight or mess with color but these kinds of things are not unsolvable. Part of the skill of a good photographer is avoiding these problems. Photoshop can also be used to fix specific problems with colour reproduction. I would bet that an experienced portrait phot...
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