why has my mouth changed?

i hav been with marapets for nearly a month, and i think i am getting the hang of this thing! I mean, in the first few days ihad failed a missiion from The Fates and made my pet have a headache! AND i accepted even tho i had no MP!!! i hav learned to actually SAVE MP, instead of spending it all at once now (lol).
Anyways, my avatars mouth mysteriously changed (it isnow wide open). Do you know why this happened? plz help.