So I've been playing for over 30+ hours now as a Khajiit and I really liked the way my character looked when I created him but recently I noticed that his faced changed, his eyes became so much smaller and his mouth that used to look like he was smiling became a frown. He looks angry now, I don't know if I'm imagining this or if my character's face really did change. Did something similar occur to you too?

I can imagine it might have to do with the reputation or karma system thats running behind the game

Now that you mention it, I seem to recall that my character's face changed after I took on daedra quests so maybe its related?

Or you've contracted a disease you don't know about. Does becoming a vampire change your features in Skyrim like it did in Oblivion?