Answers:
Katie:
I got interested in it after seeing other artists' fanart. No one in particular inspired me, but here are some who did: Polebear, Emily Haunte, Lulu999 (DeviantArt FNAF artists), and Tite Kubo (Bleach artist).
Kitten:
Several years ago, on 9/30/17!
Knight:
I started with a cartoony style at first and slowly evolved my style to what it is now. I really like anime because it's easier and has more variety.