Mirror image!

Why are some people called 'photogenic?' Why do they picture so well?
I don't picture well at all, but then I don't look nice at all, so I guess pictures tell the truth don't they? So if you're pretty or handsome or arresting, it'll show and if you're not...well, like me, you can decide to avoid being in the photographs.

Oh well, why do some mirrors show you as fat, and some tall, or thin or whatever? Yeah, why?