Yup, using the mirror still ruins origin character portraits. If you're playing as an origin character, it also happens at character creation (ie. game start), which is quite annoying. It happens even if you didn't change anything about the appearance or even click the tab, so yeah, the bug is definitely still in the game.
The same issues are complained about in these threads:
[url=http://larian.com/forums/ubbthreads.php?ubb=showflat&Number=620221][BUG] Portrait change after using magic mirror[/url]
[url=http://larian.com/forums/ubbthreads.php?ubb=showflat&Number=628463]Origin Character Portrait[/url]
